Renovate PRs consolidation

[robert-northmind]

Description

Consolidates compatible Renovate dependency updates into a single PR, prioritizing stability for a published Flutter plugin. This includes updating key plugin dependencies and development tooling while deferring higher-risk upgrades.

Related Issue(s)

Fixes #120, #122, #123, #127, #130, #142

Type of Change

• 🛠️ Bug fix (non-breaking change which fixes an issue)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation
• 📈 Performance improvement
• 🏗️ Code refactoring
• 🧹 Chore / Housekeeping

Checklist

• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have updated the CHANGELOG.md under the "Unreleased" section

Screenshots (if applicable)

Additional Notes

This PR consolidates several Renovate dependency updates, carefully selecting those compatible with the current Flutter stable toolchain and the constraints of a published plugin.

Specifically:

• Updated connectivity_plus to 7.0.0
• Updated package_info_plus to 9.0.0
• Updated repo-only tooling: flutter_lints to 6.0.0, Kotlin plugin to 2.3.10, Gradle wrapper to 8.14.4, and actions/setup-java to v5.2.0.

The AGP 9 / app plugin 9 path (related to Renovate PRs #121, #124, #125) has been deferred due to its higher risk for a plugin repo and existing compatibility issues in the example app requiring a further Gradle upgrade (9.3.1) which is not yet needed for the current dependency set.

Extensive verification was performed, including flutter analyze, flutter test, dart tool/pre_release_check.dart, and an flutter build apk of the example app.

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