fix: use int64 for retention period in API spec

This updates the Cloud Dedicated Management API spec to use the `int64`
format for the `ClusterDatabaseRetentionPeriod` schema, which matches
the corresponding type in IOx's namespace API.

api-docs/cloud-dedicated/management/openapi.yml

@@ -1597,7 +1597,7 @@ components:
 
         If the retention period is not set or is set to 0, the database will have infinite retention
       type: integer
-      format: int32
+      format: int64
       default: 0
       examples:
         - 300000000000

api-docs/getswagger.sh

@@ -155,7 +155,7 @@ function updateCloudDedicatedManagement {
   then
     echo "Using existing $outFile"
   else
-    curl $UPDATE_OPTIONS https://raw.githubusercontent.com/influxdata/granite/3117fb47d5e56afaadcebc226ff4b25785d95b5a/openapi.yaml -o $outFile
+    curl $UPDATE_OPTIONS https://raw.githubusercontent.com/influxdata/granite/ab7ee2aceacfae7f415d15ffbcf8c9d0f6f3e015/openapi.yaml -o $outFile
   fi
   postProcess $outFile 'cloud-dedicated/.config.yml' management@0
 }