Bump Gradle, AGP and Kotlin versions

[markushi]

📜 Description

Supersedes #3839

💡 Motivation and Context

New features, faster builds.

Closes #3784

💚 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	391.33 ms	440.50 ms	49.17 ms
Size	1.58 MiB	2.21 MiB	638.68 KiB

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

Startup times

Revision	Plain	With Sentry	Diff
28de1fc	399.50 ms	410.55 ms	11.05 ms
34068df	340.50 ms	374.73 ms	34.23 ms
b394bce	397.31 ms	444.14 ms	46.83 ms
2cfebea	419.29 ms	496.17 ms	76.88 ms
6c7af4b	411.45 ms	446.60 ms	35.16 ms

App size

Revision	Plain	With Sentry	Diff
28de1fc	1.58 MiB	2.21 MiB	638.69 KiB
34068df	1.58 MiB	2.21 MiB	638.78 KiB
b394bce	1.58 MiB	2.21 MiB	638.69 KiB
2cfebea	1.58 MiB	2.21 MiB	638.68 KiB
6c7af4b	1.58 MiB	2.21 MiB	638.68 KiB

[romtsn]

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