Bump Gradle, AGP and Kotlin versions

[markushi]

📜 Description

Supersedes #3839

💡 Motivation and Context

New features, faster builds.

💚 How did you test it?

📝 Checklist

• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	432.11 ms	478.15 ms	46.04 ms
Size	1.58 MiB	2.20 MiB	635.52 KiB

Previous results on branch: chore/bump-gradle-agp-kotlin-8.x.x

Startup times

Revision	Plain	With Sentry	Diff
b956ed4	394.35 ms	431.90 ms	37.55 ms
75ebeda	418.66 ms	473.06 ms	54.40 ms

App size

Revision	Plain	With Sentry	Diff
b956ed4	1.58 MiB	2.20 MiB	635.41 KiB
75ebeda	1.58 MiB	2.20 MiB	635.41 KiB

[romtsn]

can drop this thing now, right?

[romtsn]

Could you also check the comments from #3839 around uppercase/lowercase and that weird extension function?

[github-actions]

• 🚫 The changelog entry seems to be part of an already released section ## 8.0.0.
  Consider moving the entry to the ## Unreleased section, please.