[CI] Use macos-14 as the macOS runner (#157)

Author: antiagainst

.github/workflows/build-test.yml

@@ -66,7 +66,7 @@ jobs:
 
   test-macos-stable:
     name: macOS (Stable)
-    runs-on: macos-11
+    runs-on: macos-14
     steps:
       - name: Checkout out repository
         uses: actions/checkout@v2
@@ -93,7 +93,7 @@ jobs:
 
   test-ios-cross-stable:
     name: iOS (Stable, ARM, Cross Compilation)
-    runs-on: macos-11
+    runs-on: macos-14
     steps:
       - name: Checkout out repository
         uses: actions/checkout@v2