feat(cloudbuild): update the API

#### cloudbuild:v1

The following keys were added:
- schemas.WorkerConfig.properties.enableNestedVirtualization.description
- schemas.WorkerConfig.properties.enableNestedVirtualization.type

Author: yoshi-automation

discovery/cloudbuild-v1.json

@@ -2573,7 +2573,7 @@
       }
     }
   },
-  "revision": "20250718",
+  "revision": "20250801",
   "rootUrl": "https://cloudbuild.googleapis.com/",
   "schemas": {
     "ApprovalConfig": {
@@ -5864,6 +5864,10 @@
           "format": "int64",
           "type": "string"
         },
+        "enableNestedVirtualization": {
+          "description": "Optional. Enable nested virtualization on the worker, if supported by the machine type. By default, nested virtualization is disabled.",
+          "type": "boolean"
+        },
         "machineType": {
           "description": "Optional. Machine type of a worker, such as `e2-medium`. See [Worker pool config file](https://cloud.google.com/build/docs/private-pools/worker-pool-config-file-schema). If left blank, Cloud Build will use a sensible default.",
           "type": "string"

src/apis/cloudbuild/v1.ts

@@ -2509,6 +2509,10 @@ export namespace cloudbuild_v1 {
      * Size of the disk attached to the worker, in GB. See [Worker pool config file](https://cloud.google.com/build/docs/private-pools/worker-pool-config-file-schema). Specify a value of up to 4000. If `0` is specified, Cloud Build will use a standard disk size.
      */
     diskSizeGb?: string | null;
+    /**
+     * Optional. Enable nested virtualization on the worker, if supported by the machine type. By default, nested virtualization is disabled.
+     */
+    enableNestedVirtualization?: boolean | null;
     /**
      * Optional. Machine type of a worker, such as `e2-medium`. See [Worker pool config file](https://cloud.google.com/build/docs/private-pools/worker-pool-config-file-schema). If left blank, Cloud Build will use a sensible default.
      */