[CI] Update macOS workers to macos-latest

GitHub actions no longer allow `macos-11` runners

.github/workflows/ci.yml

@@ -54,7 +54,7 @@ jobs:
             cache-name: windows-x86_64-mingw
 
           - name: 🍎 macOS (universal)
-            os: macos-11
+            os: macos-latest
             platform: macos
             artifact-name: godot-cpp-macos-universal-release
             artifact-path: bin/libgodot-cpp.macos.template_release.universal.a
@@ -72,7 +72,7 @@ jobs:
             cache-name: android-arm64
 
           - name: 🍏 iOS (arm64)
-            os: macos-11
+            os: macos-latest
             platform: ios
             artifact-name: godot-cpp-ios-arm64-release
             artifact-path: bin/libgodot-cpp.ios.template_release.arm64.a