ci: bump vmactions/openbsd-vm

Bumps the github-actions group with 1 update in the / directory: [vmactions/openbsd-vm](https://github.com/vmactions/openbsd-vm).


Updates `vmactions/openbsd-vm` from 1.4.5 to 1.4.6
- [Release notes](https://github.com/vmactions/openbsd-vm/releases)
- [Commits](c941015845...e6c68b637a)

---
updated-dependencies:
- dependency-name: vmactions/openbsd-vm
  dependency-version: 1.4.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/test_bsd.yml

@@ -51,7 +51,7 @@ jobs:
           persist-credentials: false
 
       - name: Build
-        uses: vmactions/openbsd-vm@c941015845c0f0c429676840963dc63b226d4f69 # v1.4.5
+        uses: vmactions/openbsd-vm@e6c68b637a12e83519688d115d57d5b0b53923cd # v1.4.6
         with:
           usesh: true
           cache-after-prepare: true