More work on macOS CI runners

Author: gershnik

.github/workflows/build.yml

@@ -77,9 +77,9 @@ jobs:
         EOF
 
   mac:
-    runs-on: macos-15
+    runs-on: macos-14
     env: 
-      DEVELOPER_DIR: /Applications/Xcode_16.4.0.app
+      DEVELOPER_DIR: /Applications/Xcode_16.2.0.app
 
     steps:
     - name: Checkout

.github/workflows/check.yml

@@ -114,9 +114,7 @@ jobs:
         include: 
         - { os: macos-14, xcode: '15.4.0' }
         - { os: macos-15, xcode: '16.4.0' }
-        - { os: macos-15, xcode: '26.0.0' }
         - { os: macos-15-intel, xcode: '16.4.0' }
-        - { os: macos-15-intel, xcode: '26.0.0' }
         - { os: macos-26, xcode: '26.0.0' }
     env: 
       DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode }}.app