Use updated semgrep image name (#49)

Author: Piccirello

.github/workflows/security.yml

@@ -14,7 +14,7 @@ jobs:
     semgrep:
         runs-on: ubuntu-latest
         container:
-            image: returntocorp/semgrep
+            image: semgrep/semgrep
 
         steps:
             - name: Checkout