ci: update macOS builders to Sequoia (15) and Xcode 16.4

We have been building on macOS 14 and Xcode 16.0 for a longggg time now.
This gets us to a version that will be running Xcode 26 eventually so
we can ultimately build for Tahoe on a stable OS.

This should change nothing in the interim.

.github/workflows/release-pr.yml

@@ -47,7 +47,7 @@ jobs:
           sentry-cli dif upload --project ghostty --wait dsym.zip
 
   build-macos:
-    runs-on: namespace-profile-ghostty-macos
+    runs-on: namespace-profile-ghostty-macos-sequoia
     timeout-minutes: 90
     steps:
       - name: Checkout code
@@ -94,7 +94,7 @@ jobs:
       - name: Build Ghostty.app
         run: |
           cd macos
-          sudo xcode-select -s /Applications/Xcode_16.0.app
+          sudo xcode-select -s /Applications/Xcode_16.4.app
           xcodebuild -target Ghostty -configuration Release
 
       # We inject the "build number" as simply the number of commits since HEAD.
@@ -199,7 +199,7 @@ jobs:
           destination-dir: ./
 
   build-macos-debug:
-    runs-on: namespace-profile-ghostty-macos
+    runs-on: namespace-profile-ghostty-macos-sequoia
     timeout-minutes: 90
     steps:
       - name: Checkout code
@@ -246,7 +246,7 @@ jobs:
       - name: Build Ghostty.app
         run: |
           cd macos
-          sudo xcode-select -s /Applications/Xcode_16.0.app
+          sudo xcode-select -s /Applications/Xcode_16.4.app
           xcodebuild -target Ghostty -configuration Release
 
       # We inject the "build number" as simply the number of commits since HEAD.

.github/workflows/release-tag.yml

@@ -120,7 +120,7 @@ jobs:
 
   build-macos:
     needs: [setup]
-    runs-on: namespace-profile-ghostty-macos
+    runs-on: namespace-profile-ghostty-macos-sequoia
     timeout-minutes: 90
     env:
       GHOSTTY_VERSION: ${{ needs.setup.outputs.version }}
@@ -139,7 +139,7 @@ jobs:
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
 
       - name: XCode Select
-        run: sudo xcode-select -s /Applications/Xcode_16.0.app
+        run: sudo xcode-select -s /Applications/Xcode_16.4.app
 
       - name: Setup Sparkle
         env:
@@ -288,7 +288,7 @@ jobs:
 
   appcast:
     needs: [setup, build-macos]
-    runs-on: namespace-profile-ghostty-macos
+    runs-on: namespace-profile-ghostty-macos-sequoia
     env:
       GHOSTTY_VERSION: ${{ needs.setup.outputs.version }}
       GHOSTTY_BUILD: ${{ needs.setup.outputs.build }}

.github/workflows/release-tip.yml

@@ -154,7 +154,7 @@ jobs:
         )
       }}
 
-    runs-on: namespace-profile-ghostty-macos
+    runs-on: namespace-profile-ghostty-macos-sequoia
     timeout-minutes: 90
     steps:
       - name: Checkout code
@@ -173,7 +173,7 @@ jobs:
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
 
       - name: XCode Select
-        run: sudo xcode-select -s /Applications/Xcode_16.0.app
+        run: sudo xcode-select -s /Applications/Xcode_16.4.app
 
       # Setup Sparkle
       - name: Setup Sparkle
@@ -369,7 +369,7 @@ jobs:
         )
       }}
 
-    runs-on: namespace-profile-ghostty-macos
+    runs-on: namespace-profile-ghostty-macos-sequoia
     timeout-minutes: 90
     steps:
       - name: Checkout code
@@ -388,7 +388,7 @@ jobs:
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
 
       - name: XCode Select
-        run: sudo xcode-select -s /Applications/Xcode_16.0.app
+        run: sudo xcode-select -s /Applications/Xcode_16.4.app
 
       # Setup Sparkle
       - name: Setup Sparkle
@@ -544,7 +544,7 @@ jobs:
         )
       }}
 
-    runs-on: namespace-profile-ghostty-macos
+    runs-on: namespace-profile-ghostty-macos-sequoia
     timeout-minutes: 90
     steps:
       - name: Checkout code
@@ -563,7 +563,7 @@ jobs:
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
 
       - name: XCode Select
-        run: sudo xcode-select -s /Applications/Xcode_16.0.app
+        run: sudo xcode-select -s /Applications/Xcode_16.4.app
 
       # Setup Sparkle
       - name: Setup Sparkle

.github/workflows/test.yml

@@ -270,7 +270,7 @@ jobs:
             ghostty-source.tar.gz
 
   build-macos:
-    runs-on: namespace-profile-ghostty-macos
+    runs-on: namespace-profile-ghostty-macos-sequoia
     needs: test
     steps:
       - name: Checkout code
@@ -286,7 +286,7 @@ jobs:
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
 
       - name: Xcode Select
-        run: sudo xcode-select -s /Applications/Xcode_16.0.app
+        run: sudo xcode-select -s /Applications/Xcode_16.4.app
 
       - name: get the Zig deps
         id: deps
@@ -361,7 +361,7 @@ jobs:
           xcodebuild -target Ghostty-iOS "CODE_SIGNING_ALLOWED=NO"
 
   build-macos-matrix:
-    runs-on: namespace-profile-ghostty-macos
+    runs-on: namespace-profile-ghostty-macos-sequoia
     needs: test
     steps:
       - name: Checkout code
@@ -377,7 +377,7 @@ jobs:
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
 
       - name: Xcode Select
-        run: sudo xcode-select -s /Applications/Xcode_16.0.app
+        run: sudo xcode-select -s /Applications/Xcode_16.4.app
 
       - name: get the Zig deps
         id: deps
@@ -679,7 +679,7 @@ jobs:
           nix develop -c zig build -Dsentry=${{ matrix.sentry }}
 
   test-macos:
-    runs-on: namespace-profile-ghostty-macos
+    runs-on: namespace-profile-ghostty-macos-sequoia
     needs: test
     steps:
       - name: Checkout code
@@ -695,7 +695,7 @@ jobs:
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
 
       - name: Xcode Select
-        run: sudo xcode-select -s /Applications/Xcode_16.0.app
+        run: sudo xcode-select -s /Applications/Xcode_16.4.app
 
       - name: get the Zig deps
         id: deps