Update step-security/harden-runner action to v2.9.1 (#37)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/testing.yml

@@ -32,7 +32,7 @@ jobs:
         go: [ "1.19", "1.20" ]
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@1f99358870fe1c846a3ccba386cc2b2246836776 # v2.2.1
+        uses: step-security/harden-runner@5c7944e73c4c2a096b17a9cb74d65b6c2bbafbde # v2.9.1
         with:
           egress-policy: audit
           disable-telemetry: true