chore(samples): run the Android build on Gradle 9.1 and Crashlytics 3.0

[xsahil03x]

The sample app's Android build fails on current Android Studio: Gradle 8.14 doesn't run on its bundled Java 25. This moves the Gradle wrapper to 9.1.0, the first release that supports Java 25, and the Crashlytics Gradle plugin to 3.0.0, because 2.8.1 uses groovy.util.XmlSlurper, which Gradle 9 removed (release builds failed at uploadCrashlyticsMappingFileRelease). Both are the minimum versions that work.

Verified with release APK builds on Flutter 3.44.0 and 3.47.5; 2.8.1 on Gradle 9.1.0 still fails, so the plugin bump is needed. Split out of #3023.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated the tooling used to build the Android app. This change affects the app’s build setup; no end-user-facing features or behavior changes are included.

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 571382f8-3185-4aae-a6d5-93b4180dd98d

📥 Commits

Reviewing files that changed from the base of the PR and between 8d76439 and 05331a2.

📒 Files selected for processing: 2

• sample_app/android/gradle/wrapper/gradle-wrapper.properties
• sample_app/android/settings.gradle

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📝 Walkthrough

The Android sample app updates its Gradle wrapper to Gradle 9.1.0 and its Firebase Crashlytics Gradle plugin to version 3.0.0.

Changes: Android build versions

Layer / File(s)	Summary
Update Android build versions sample_app/android/gradle/wrapper/gradle-wrapper.properties, sample_app/android/settings.gradle	The wrapper distribution changes from Gradle 8.14.3 to 9.1.0. The Firebase Crashlytics Gradle plugin changes from 2.8.1 to 3.0.0.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 05331

The Android build versions are updated, but available compatibility evidence establishes no concrete release-build failure or resulting user impact; no actionable merge blocker remains.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main changes: updating the Android build to Gradle 9.1 and Crashlytics 3.0.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.56%. Comparing base (8d76439) to head (05331a2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3067   +/-   ##
=======================================
  Coverage   78.56%   78.56%           
=======================================
  Files         452      452           
  Lines       29451    29451           
=======================================
  Hits        23139    23139           
  Misses       6312     6312           

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