chore(deps): bump step-security/harden-runner from 2.19.4 to 2.20.0 (hiero-ledger#2436)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/bot-contributor-lifecycle.yml

@@ -64,7 +64,7 @@ jobs:
 
     steps:
       - name: Harden the runner
-        uses: step-security/harden-runner@9af89fc71515a100421586dfdb3dc9c984fbf411 #v2.19.4
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 #v2.20.0
         with:
           egress-policy: audit