deps upgrade Kotlin languageVersion to 1.8

[buenaflor]

📜 Description

Fixes error

Task :sentry_flutter:compileDebugKotlin FAILED
e: Language version 1.6 is no longer supported; please, use version 1.8 or greater.

which happens when bumping the kotlin-android plugin to 2.2.0

💡 Motivation and Context

Closes #3028

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.09%. Comparing base (8c8e541) to head (ad3ab4f).
Report is 2 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (8c8e541) and HEAD (ad3ab4f). Click for more details.

HEAD has 8 uploads less than BASE

Flag	BASE (8c8e541)	HEAD (ad3ab4f)
	9	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3032       +/-   ##
===========================================
- Coverage   87.97%   63.09%   -24.89%     
===========================================
  Files         287        4      -283     
  Lines        9533      168     -9365     
===========================================
- Hits         8387      106     -8281     
+ Misses       1146       62     -1084     

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[denrase]

Should we mark this a s a breaking change?

[buenaflor]

I'll mark it as potentially breaking. the number of people potentially affected should be really low

[buenaflor]

But I'll try it out first myself in a sample app

[buenaflor]

Tried it out, still compiles even with older plugin versions fine

[buenaflor]

changelog sanity check. since @stefanosiano clarified it's fine to update it and won't affect users, I guess it shouldn't hurt to still call out to update the toolchain if its outdated?

[kahest]

changelog sanity check. since @stefanosiano clarified it's fine to update it and won't affect users, I guess it shouldn't hurt to still call out to update the toolchain if its outdated?

yep we should call it out clearly, it's still a breaking change in the sense that people might need to update toolchains not just locally, but also on CI etc.

[buenaflor]

Updated the changelog

[buenaflor]

@kahest wdyt of the changelog, updated it to be 'potentially breaking'

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- deps upgrade Kotlin languageVersion to `1.8` ([#3032](https://github.com/getsentry/sentry-dart/pull/3032))

If none of the above apply, you can opt out of this check by adding #skip-changelog to the PR description.

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