ci: pin CMake on macOS unit tests

The macos-latest runner now ships CMake 4.2.x, but the project pins
CMAKE_VERSION 4.1.2 (matching the React Native template and the version
used by the test-macos / Android SDK jobs). The unit-tests job did not
pin CMake, so macOS builds picked up the incompatible runner default.
Install the pinned version via jwlawson/actions-setup-cmake, mirroring
the test-macos job, gated to macOS runners.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UCN2h9xbyn4yhxfVZyMzAm

Author: kraenhansen

.github/workflows/check.yml

@@ -92,6 +92,12 @@ jobs:
         with:
           packages: tools platform-tools ndk;${{ env.NDK_VERSION }}
       - run: rustup target add x86_64-linux-android aarch64-linux-android armv7-linux-androideabi i686-linux-android aarch64-apple-ios-sim
+      # macOS runners ship a newer CMake than the project supports; pin it to match the version used elsewhere in CI
+      - name: Install compatible CMake version
+        if: runner.os == 'macOS'
+        uses: jwlawson/actions-setup-cmake@v2
+        with:
+          cmake-version: ${{ env.CMAKE_VERSION }}
       - run: npm ci
       - run: npm run bootstrap
       - run: npm test