Increase gradle memory pool size from 4gb to 12gb, crash on OOM

[markushi]

📜 Description

#skip-changelog

An attempt to fix CI issues where certain gradle tasks simply get stuck forever. E.g. https://github.com/getsentry/sentry-java/actions/runs/8200009043/job/22426029447?pr=3253#step:5:1524

💡 Motivation and Context

Reliable CI!

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code.
• 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.
• 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

[stefanosiano]

doesn't work 😕