ci: add harden-runner to deploy workflow

Author: MattIPv4

.github/workflows/deploy.yml

@@ -15,6 +15,11 @@ jobs:
       contents: read
 
     steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
+        with:
+          egress-policy: audit
+          
       - name: Git Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2