Update Gradle version to 8.8

[0xnm]

What does this PR do?

This PR updates Gradle version to 8.8.

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [ ] Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• [ ] Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.34%. Comparing base (cf789ce) to head (d74b74a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## nogorodnikov/update-agp-to-8.5.0 #277 +/- ## ====================================================================== - Coverage 78.38% 78.34% -0.04% Complexity 254 254 ====================================================================== Files 31 31 Lines 911 914 +3 Branches 114 114 ====================================================================== + Hits 714 716 +2 Misses 147 147 - Partials 50 51 +1 ``` [see 2 files with indirect coverage changes](https://app.codecov.io/gh/DataDog/dd-sdk-android-gradle-plugin/pull/277/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog)