Revert "ci: register the detected apple-clang version with conan on macOS"

This reverts commit 73594d1bb3.

.github/actions/xahau-ga-dependencies/action.yml

@@ -120,13 +120,6 @@ runs:
 
         # Add macOS-specific conf if needed
         if [ "${{ inputs.os }}" = "Macos" ]; then
-          # Conan's built-in settings.yml lags new Xcode releases; register the
-          # detected apple-clang version so the profile validates.
-          cat > ~/.conan2/settings_user.yml <<EOF
-        compiler:
-          apple-clang:
-            version: ["${{ inputs.compiler_version }}"]
-        EOF
           cat >> ~/.conan2/profiles/default <<EOF
 
         [conf]