Potential fix for code scanning alert no. 1: Workflow does not contain permissions (#204)

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: aaguiarz

.github/workflows/semgrep.yaml

@@ -6,6 +6,8 @@ on:
 jobs:
   semgrep:
     name: Scan
+    permissions:
+      contents: read
     runs-on: ubuntu-latest
     container:
       image: returntocorp/semgrep