Fix KtLint version in `local_ci` script

[0xnm]

What does this PR do?

The relevant version on CI according to the pipeline version is 0.50.0, so fixing it.

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 83.28%. Comparing base (988232e) to head (9866df4). Report is 2 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #2039 +/- ## =========================================== + Coverage 82.85% 83.28% +0.43% =========================================== Files 491 491 Lines 17700 17671 -29 Branches 2683 2680 -3 =========================================== + Hits 14664 14716 +52 + Misses 2300 2222 -78 + Partials 736 733 -3 ``` [see 27 files with indirect coverage changes](https://app.codecov.io/gh/DataDog/dd-sdk-android/pull/2039/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog)