ci: Use macos-latest runner instead of pinning macos-14 (#8312)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -49,7 +49,7 @@ jobs:
           SUCCESS: 0
 
         - os: mac
-          OS_LABEL: macos-14
+          OS_LABEL: macos-latest
           CADDY_BIN_PATH: ./cmd/caddy/caddy
           SUCCESS: 0
 

.github/workflows/lint.yml

@@ -36,7 +36,7 @@ jobs:
           OS_LABEL: ubuntu-latest
 
         - os: mac
-          OS_LABEL: macos-14
+          OS_LABEL: macos-latest
 
         - os: windows
           OS_LABEL: windows-latest