CodeGen from PR 18430 in Azure/azure-rest-api-specs

Set cache patching default time as 5 hours (#18430)

Co-authored-by: Kanchan Joshi <[email protected]>

Author: SDKAuto

schemas/2020-12-01/Microsoft.Cache.json

@@ -817,8 +817,9 @@
         },
         "maintenanceWindow": {
           "type": "string",
+          "default": "PT5H",
           "format": "duration",
-          "description": "ISO8601 timespan specifying how much time cache patching can take. "
+          "description": "ISO8601 timespan specifying how much time cache patching can take."
         },
         "startHourUtc": {
           "oneOf": [