Fixed macOS 12 image name

Author: bok-

.github/workflows/tests.yml

@@ -15,7 +15,7 @@ on:
 jobs:
   tests-macos12:
     name: Test Builds - macOS 12
-    runs-on: macos-12.0
+    runs-on: macos-12
     strategy:
       matrix:
         xcode: [ "13.1", "13.2.1", "13.3.1", "13.4.1" ]