Update snyk-container.yml

Author: patrikjuvonen

.github/workflows/snyk-container.yml

@@ -52,7 +52,7 @@ jobs:
     # Patch for https://github.com/github/codeql-action/issues/2187
     - name: Replace security-severity undefined for license-related findings
       run: |
-        sed -i 's/"security-severity": "undefined"/"security-severity": "0"/g' snyk.sarif
+        sed -i 's/"security-severity": "null"/"security-severity": "0"/g' snyk.sarif
     - name: Upload result to GitHub Code Scanning
       uses: github/codeql-action/upload-sarif@v3
       with: