Fix missing Xcode 15.2 runs

Author: andrewheard

.github/workflows/core_extension.yml

@@ -20,19 +20,19 @@ jobs:
     strategy:
       matrix:
         target: [ios, tvos, macos, watchos]
-        include:
+        build-env:
           - os: macos-14
             xcode: Xcode_15.2
           - os: macos-15
             xcode: Xcode_16.1
-    runs-on: ${{ matrix.os }}
+    runs-on: ${{ matrix.build-env.os }}
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: Xcode
-      run: sudo xcode-select -s /Applications/${{ matrix.xcode }}.app/Contents/Developer
+      run: sudo xcode-select -s /Applications/${{ matrix.build-env.xcode }}.app/Contents/Developer
     - name: Build and test
       run: scripts/third_party/travis/retry.sh scripts/pod_lib_lint.rb FirebaseCoreExtension.podspec --platforms=${{ matrix.target }}