ci: remove Semgrep App token dependency

Author: hyperpolymath

.github/workflows/semgrep.yml

@@ -29,8 +29,6 @@ jobs:
       - uses: actions/checkout@v7.0.1
       - name: Run Semgrep
         run: semgrep scan --sarif --output=semgrep.sarif --config=auto .
-        env:
-          SEMGREP_APP_TOKEN: ${{ secrets.SEMGREP_APP_TOKEN }}
       - name: Upload SARIF
         uses: github/codeql-action/upload-sarif@v4.37.9
         with: