fix(deps): update dependency com.google.cloud.tools:appengine-gradle-plugin to v2.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud.tools:appengine-gradle-plugin	2.8.0 -> 2.8.1

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Release Notes

GoogleCloudPlatform/appengine-plugins (com.google.cloud.tools:appengine-gradle-plugin)

### [`v2.8.1`](https://togithub.com/GoogleCloudPlatform/appengine-plugins/blob/HEAD/CHANGELOG.md#281-2024-07-18) ##### Bug Fixes - Fixed a test that fails in Docker environment

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