FEATURE REQUEST: Upgrade deprecated dependencies and Gradle versions

[hasanravda]

Is your feature request related to a problem?

• Yes, it is related to a problem

Describe the feature you'd like

🌟 Feature Description

Upgrade deprecated dependencies and Gradle versions to ensure compatibility with the latest Flutter SDK and Android tooling.
This includes updating google_sign_in, speech_to_text, Android Gradle Plugin, and Kotlin to supported versions, along with necessary code adjustments for google_sign_in v7.

🔍 Problem Statement

The project currently relies on outdated dependencies:

• google_sign_in (^6.x.x) → deprecated, conflicts with current Flutter SDK.
• speech_to_text (older version) → missing bug fixes and stability updates.
• Android Gradle Plugin (8.2.1) and Kotlin (1.8.22) → both deprecated and flagged for removal in upcoming Flutter releases.

These cause build warnings, version conflicts, and reduced compatibility with modern development tools.

🎯 Expected Outcome

• All affected dependencies upgraded to latest stable versions:
  • google_sign_in: ^7.x.x
  • speech_to_text: ^6.x.x
  • AGP → 8.5.2
  • Kotlin → 1.9.25
• Code updated for google_sign_in v7 breaking changes.
• Project builds successfully on the latest Flutter SDK without deprecation warnings.
• Verified smooth sign-in and speech recognition functionality after upgrades.

Record

• I agree to follow this project's Code of Conduct
• I want to work on implementing this feature