feat(lsp): opt-in to dynamicRegistration for inlay hints (#24102)

Since https://github.com/neovim/neovim/pull/23681 there is dynamic
registration support. We should use that for new features unless there
is a good reason to turn it off.

runtime/lua/vim/lsp/protocol.lua

@@ -642,7 +642,7 @@ function protocol.make_client_capabilities()
     },
     textDocument = {
       inlayHint = {
-        dynamicRegistration = false,
+        dynamicRegistration = true,
         resolveSupport = {
           properties = {},
         },