Update step-security/harden-runner digest to 6ec6af7

Author: renovate[bot]

.github/workflows/scorecards.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@1247074da8883f2eb1fbc10a809f0f055df3068a
+        uses: step-security/harden-runner@6ec6af7d622602bd852df48848f3cae95c760a48
         with:
           egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs