ci: remove running CI for superseded commits (#8213)

Author: dblythy

.github/workflows/ci.yml

@@ -186,7 +186,7 @@ jobs:
         image: redis
         ports:
             - 6379:6379
-    env:      
+    env:
       MONGODB_VERSION: ${{ matrix.MONGODB_VERSION }}
       MONGODB_TOPOLOGY: ${{ matrix.MONGODB_TOPOLOGY }}
       MONGODB_STORAGE_ENGINE: ${{ matrix.MONGODB_STORAGE_ENGINE }}
@@ -288,3 +288,6 @@ jobs:
         env:
           CI: true
       - run: bash <(curl -s https://codecov.io/bash)
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true