ci(macos): increase timeout from 45 to 75 minutes for cloud_firestore builds

Author: MichaelVerdon

.github/workflows/macos.yaml

@@ -27,7 +27,7 @@ on:
 jobs:
   macos:
     runs-on: macos-15
-    timeout-minutes: 45
+    timeout-minutes: 75
     strategy:
       fail-fast: false
       matrix: