stabilize the semgrep image.

Author: ondbeh

.github/workflows/semgrep.yaml

@@ -11,7 +11,7 @@ jobs:
     # Skip any PR created by dependabot to avoid permission issues
     if: (github.actor != 'dependabot[bot]')
     container:
-      image: semgrep/semgrep:latest
+      image: semgrep/semgrep:1.168.0@sha256:59fbed6127ea7c5dde3ba6a85142733bb20ea9aaa36120c953904f1539aaf66e
     steps:
       # Fetch project source
       - uses: actions/checkout@v7