[espresso] Bump gradle plugin to 9.1.1

[camsim99]

Bumps com.android.tools.build:gradle from 8.13.1 to 9.1.1 in packages/espresso.

[flutter-dashboard]

It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging.

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[gemini-code-assist]

Code Review

This pull request updates the Android Gradle Plugin to version 9.1.1 and increments the package version to 0.4.0+25. Feedback indicates that this update is a breaking change for the build environment and requires a minor version bump to 0.5.0 to comply with semantic versioning, along with a matching update to the changelog header.

[gemini-code-assist]

Bumping the Android Gradle Plugin to a new major version (9.x) is a significant change that typically introduces new toolchain requirements, such as Gradle 9.0+ and JDK 21. This is considered a breaking change for the build environment of consumers. Per the semantic versioning principles followed in this repository (referencing the flutter/packages contribution guide), breaking changes for packages below 1.0.0 should increment the minor version.

version: 0.5.0

References

1. Code should follow the guidance and principles described in the flutter/packages contribution guide, which includes following semantic versioning for breaking changes. ^(link)

[gemini-code-assist]

The version header should be updated to match the new version in pubspec.yaml.

Suggested change

	## 0.4.0+25
	## 0.5.0