ci: allow coresite-atl.mm.fcix.net in harden-runner

Signed-off-by: Mounil <mounilkankhara@gmail.com>

Author: Mounil2005

.github/workflows/pr-check-test.yml

@@ -25,6 +25,8 @@ jobs:
         uses: step-security/harden-runner@a90bcbc6539c36a85cdfeb73f7e2f433735f215b # v2.15.0
         with:
           egress-policy: audit
+          allowed-endpoints: >
+            coresite-atl.mm.fcix.net:443
 
       - name: Checkout repository
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1