Upgrade Sentry Gradle plugin from 5.9.0 to 6.1.0

[sdzhong]

Summary

• Upgrades the Sentry Gradle plugin (io.sentry.android.gradle) from 5.9.0 to 6.1.0

Test plan

• Build the project and verify it compiles successfully
• Verify Sentry source context and native symbol upload still work

🤖 Generated with Claude Code

[sdzhong]

Will validate the SDK upgrade by EOW then request review afterwards

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (d45c76d) to head (7a5e226).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../example/vu/android/empowerplant/MainFragment.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #202   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         16      16           
  Lines        864     864           
  Branches      65      65           
=====================================
  Misses       864     864           

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[sdzhong]

Hey @maxkosty , please review.

I've validated with:

1. Flagship error
2. Flagship txn; its profile

Performance Issues

1. DB on Main Thread
2. File IO on Main Thread
3. Regex on Main Thread
4. Image Decoding on Main Thread
5. JSON Decoding on Main Thread

Internal checklist https://www.notion.so/sentry/31b8b10e4b5d802ab56beef45b409743