adopting suggestion from @firewave

Signed-off-by: Konstantinos <kitsios.konst@gmail.com>

Author: kitsiosk

.github/workflows/codeql-analysis.yml

@@ -15,9 +15,9 @@ on:
 permissions:
   contents: read
 
-# concurrency:
-#   group: ${{ github.event_name }}-${{ github.workflow }}-${{ github.head_ref || github.ref }}
-#   cancel-in-progress: ${{ github.event_name == 'pull_request' }} # this will cancel only PRs
+concurrency:
+  group: ${{ github.event_name }}-${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }} # this will cancel only PRs
 
 jobs:
   analyze: