fix(migrationcenter): update the API

#### migrationcenter:v1alpha1

The following keys were changed:
- schemas.OutputFile.properties.fileSizeBytes.format
- schemas.OutputFile.properties.fileSizeBytes.type

Author: yoshi-automation

discovery/migrationcenter-v1alpha1.json

@@ -2554,7 +2554,7 @@
       }
     }
   },
-  "revision": "20250710",
+  "revision": "20250724",
   "rootUrl": "https://migrationcenter.googleapis.com/",
   "schemas": {
     "AddAssetsToGroupRequest": {
@@ -6874,9 +6874,9 @@
         },
         "fileSizeBytes": {
           "description": "Output only. File size in bytes.",
-          "format": "int32",
+          "format": "int64",
           "readOnly": true,
-          "type": "integer"
+          "type": "string"
         },
         "xlsxOutputFile": {
           "$ref": "XlsxOutputFile",

src/apis/migrationcenter/v1alpha1.ts

@@ -2978,7 +2978,7 @@ export namespace migrationcenter_v1alpha1 {
     /**
      * Output only. File size in bytes.
      */
-    fileSizeBytes?: number | null;
+    fileSizeBytes?: string | null;
     /**
      * Output only. XLSX output file.
      */