Change cmake version

Author: cherylEnkidu

scripts/install_prereqs.sh

@@ -104,7 +104,15 @@ case "$project-$platform-$method" in
     ;;
 
   Firestore-iOS-cmake | Firestore-tvOS-cmake | Firestore-macOS-cmake)
-    brew outdated cmake || brew upgrade cmake
+# 1. Create your own tap (once)
+brew tap-new $USER/versions
+
+# 2. Extract cmake version 3.31 into your tap
+brew extract --version=3.31 cmake $USER/versions
+
+# 3. Install it
+brew install $USER/versions/[email protected]
+
     brew outdated go || brew upgrade go # Somehow the build for Abseil requires this.
     brew install ccache
     brew install ninja