chore: [StepSecurity] Apply security best practices (#688)

Co-authored-by: stepsecurity-app[bot] <188008098+stepsecurity-app[bot]@users.noreply.github.com>
Signed-off-by: Miguel_LZPF <miguel.carpena@io.builders>

Author: stepsecurity-app[bot]

.github/workflows/ats.publish.yml

@@ -155,6 +155,11 @@ jobs:
     needs: [contracts, sdk]
     if: always()
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        with:
+          egress-policy: audit
+
       - name: Report Results
         run: |
           echo "## ATS Publish Results" >> $GITHUB_STEP_SUMMARY

.github/workflows/mp.publish.yml

@@ -109,6 +109,11 @@ jobs:
     needs: [mass-payout]
     if: always()
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
+        with:
+          egress-policy: audit
+
       - name: Report Results
         run: |
           echo "## Mass Payout Publish Results" >> $GITHUB_STEP_SUMMARY