Add endpoint override for us-isof-* region (#4629)

Author: trivikr

.changes/next-release/bugfix-Endpoints-8c993a32.json

@@ -0,0 +1,5 @@
+{
+  "type": "bugfix",
+  "category": "Endpoints",
+  "description": "Add endpoint override for us-isof-* region"
+}

lib/region_config_data.json

@@ -9,6 +9,7 @@
     "eu-isoe-*/*": "euIsoe",
     "us-iso-*/*": "usIso",
     "us-isob-*/*": "usIsob",
+    "us-isof-*/*": "usIsof",
     "*/budgets": "globalSSL",
     "*/cloudfront": "globalSSL",
     "*/sts": "globalSSL",
@@ -253,6 +254,9 @@
     "usIsob": {
       "endpoint": "{service}.{region}.sc2s.sgov.gov"
     },
+    "usIsof": {
+      "endpoint": "{service}.{region}.csp.hci.ic.gov"
+    },
     "fipsStandard": {
       "endpoint": "{service}-fips.{region}.amazonaws.com"
     },