feat(sqladmin): update the API

#### sqladmin:v1beta4

The following keys were added:
- schemas.InsightsConfig.properties.queryPlansPerMinute.description
- schemas.InsightsConfig.properties.queryPlansPerMinute.format
- schemas.InsightsConfig.properties.queryPlansPerMinute.type

The following keys were changed:
- schemas.DatabaseInstance.properties.serviceAccountEmailAddress.description

discovery/sqladmin-v1beta4.json

@@ -1834,7 +1834,7 @@
       }
     }
   },
-  "revision": "20210420",
+  "revision": "20210521",
   "rootUrl": "https://sqladmin.googleapis.com/",
   "schemas": {
     "AclEntry": {
@@ -2413,7 +2413,7 @@
           "description": "SSL configuration."
         },
         "serviceAccountEmailAddress": {
-          "description": "The service account email address assigned to the instance. This property is applicable only to Second Generation instances.",
+          "description": "The service account email address assigned to the instance. This property is read-only.",
           "type": "string"
         },
         "settings": {
@@ -2916,6 +2916,11 @@
           "description": "Whether Query Insights feature is enabled.",
           "type": "boolean"
         },
+        "queryPlansPerMinute": {
+          "description": "Number of query plans generated by Insights per minute. Default is 5. Changing this will restart the database.",
+          "format": "int32",
+          "type": "integer"
+        },
         "queryStringLength": {
           "description": "Maximum query length stored in bytes. Default value: 1024 bytes. Range: 256-4500 bytes. Query length more than this field value will be truncated to this value. When unset, query length will be the default value. Changing query length will restart the database.",
           "format": "int32",

src/apis/sqladmin/v1beta4.ts

@@ -542,7 +542,7 @@ export namespace sqladmin_v1beta4 {
      */
     serverCaCert?: Schema$SslCert;
     /**
-     * The service account email address assigned to the instance. This property is applicable only to Second Generation instances.
+     * The service account email address assigned to the instance. This property is read-only.
      */
     serviceAccountEmailAddress?: string | null;
     /**
@@ -832,6 +832,10 @@ export namespace sqladmin_v1beta4 {
      * Whether Query Insights feature is enabled.
      */
     queryInsightsEnabled?: boolean | null;
+    /**
+     * Number of query plans generated by Insights per minute. Default is 5. Changing this will restart the database.
+     */
+    queryPlansPerMinute?: number | null;
     /**
      * Maximum query length stored in bytes. Default value: 1024 bytes. Range: 256-4500 bytes. Query length more than this field value will be truncated to this value. When unset, query length will be the default value. Changing query length will restart the database.
      */