[StepSecurity] Apply security best practices

Signed-off-by: StepSecurity Bot <bot@stepsecurity.io>

.github/workflows/PR-Demo-cleanup.yml

@@ -18,6 +18,11 @@ jobs:
     if: github.event.action == 'closed'
     
     steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@0080882f6c36860b6ba35c610c98ce87d4e2f26f # v2.10.2
+        with:
+          egress-policy: audit
+
       - name: Set up SSH
         run: |
           mkdir -p ~/.ssh/
@@ -60,7 +65,7 @@ jobs:
 
       - name: Post cleanup notice to PR
         if: steps.cleanup.outputs.cleanup_performed == 'true'
-        uses: actions/github-script@v7
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           script: |
             const { GITHUB_REPOSITORY } = process.env;