feat(cloudbuild): update the api

#### cloudbuild:v2

The following keys were deleted:
- schemas.SecretVolumeSource.properties.secretVersion.readOnly (Total Keys: 1)

The following keys were added:
- schemas.Security.properties.privilegeMode.deprecated (Total Keys: 1)

Author: yoshi-automation

googleapiclient/discovery_cache/documents/cloudbuild.v2.json

@@ -844,7 +844,7 @@
 }
 }
 },
-"revision": "20240704",
+"revision": "20240720",
 "rootUrl": "https://cloudbuild.googleapis.com/",
 "schemas": {
 "AuditConfig": {
@@ -2513,8 +2513,7 @@
 "type": "string"
 },
 "secretVersion": {
-"description": "Output only. Resource name of the SecretVersion. In format: projects/*/secrets/*/versions/*",
-"readOnly": true,
+"description": "Optional. Resource name of the SecretVersion. In format: projects/*/secrets/*/versions/*",
 "type": "string"
 }
 },
@@ -2525,6 +2524,7 @@
 "id": "Security",
 "properties": {
 "privilegeMode": {
+"deprecated": true,
 "description": "Optional. Privilege mode.",
 "enum": [
 "PRIVILEGE_MODE_UNSPECIFIED",