chore(deps): update dependency com.google.cloud.tools:appengine-gradle-plugin to v2.4.2

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud.tools:appengine-gradle-plugin	2.2.0 -> 2.4.2

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Release Notes

GoogleCloudPlatform/app-gradle-plugin

v2.4.2

Changed

• Update to appengine-plugins-core 0.9.5 (#​405)

v2.4.1

Fixed

• Fixed bug when using plugins block in build.gradle (#​388)

v2.4.0

Added

• appengine.tools.verbosity option for defining gcloud log verbosity (#​384)

v2.3.0

Changed

• Update to appengine-plugins-core 0.9.0 (#​377)
  • Includes support for binary artifacts for app.yaml based deployments (appengine-plugins-core:#​840)

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