Update crazy-max/ghaction-container-scan digest to f91f8af

Author: renovate[bot]

.github/workflows/cve-scanning-docker.yml

@@ -13,7 +13,7 @@ jobs:
         run: docker build -f Dockerfile -t user/app:latest .
         working-directory: docker
       - name: Scan for vulnerabilities
-        uses: crazy-max/ghaction-container-scan@674eade7c71e59463c98239c5f8ff505e2449bc0
+        uses: crazy-max/ghaction-container-scan@f91f8af88b424192512e34188cc7c23927080648
         with:
           image: user/app:latest
         env: