chore: regenerate merchantapi client (googleapis#28308)

Generated in GitHub action: https://togithub.com/googleapis/googleapis/google-api-java-client-services/actions/workflows/codegen.yaml

Author: yoshi-code-bot

clients/google-api-services-merchantapi/accounts_v1/2.0.0/README.md

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+# Merchant API Client Library for Java
+
+Programmatically manage your Merchant Center Accounts.
+
+This page contains information about getting started with the Merchant API
+using the Google API Client Library for Java. In addition, you may be interested
+in the following documentation:
+
+* Browse the [Javadoc reference for the Merchant API][javadoc]
+* Read the [Developer's Guide for the Google API Client Library for Java][google-api-client].
+* Interact with this API in your browser using the [APIs Explorer for the Merchant API][api-explorer]
+
+## Installation
+
+### Maven
+
+Add the following lines to your `pom.xml` file:
+
+```xml
+<project>
+  <dependencies>
+    <dependency>
+      <groupId>com.google.apis</groupId>
+      <artifactId>google-api-services-merchantapi</artifactId>
+      <version>accounts_v1-rev20250804-2.0.0</version>
+    </dependency>
+  </dependencies>
+</project>
+```
+
+### Gradle
+
+```gradle
+repositories {
+  mavenCentral()
+}
+dependencies {
+  implementation 'com.google.apis:google-api-services-merchantapi:accounts_v1-rev20250804-2.0.0'
+}
+```
+
+[javadoc]: https://googleapis.dev/java/google-api-services-merchantapi/latest/index.html
+[google-api-client]: https://github.com/googleapis/google-api-java-client/
+[api-explorer]: https://developers.google.com/apis-explorer/#p/merchantapi/v1/