Use native x86_64 runners for macOS abi-cafe tests too

.github/workflows/abi-cafe.yml

@@ -28,7 +28,7 @@ jobs:
           - os: ubuntu-24.04-arm
             env:
               TARGET_TRIPLE: aarch64-unknown-linux-gnu
-          - os: macos-latest
+          - os: macos-13
             env:
               TARGET_TRIPLE: x86_64-apple-darwin
           - os: macos-latest
@@ -59,10 +59,6 @@ jobs:
       if: matrix.env.TARGET_TRIPLE == 'x86_64-pc-windows-gnu'
       run: rustup set default-host x86_64-pc-windows-gnu
 
-    - name: Use x86_64 compiler on macOS
-      if: matrix.os == 'macos-latest' && matrix.env.TARGET_TRIPLE == 'x86_64-apple-darwin'
-      run: rustup set default-host x86_64-apple-darwin
-
     - name: Prepare dependencies
       run: ./y.sh prepare