[GH] Update contribution guide to reflect JDK 17 is now required
[GH] Update contribution guide to reflect JDK 17 is now required

## Proposed Changes

Update contribution guide to reflect JDK 17 is now required

## Testing

Test: N/A

This is an imported pull request from https://github.com/androidx/androidx/pull/453.

Resolves #453
Github-Pr-Head-Sha: 412feee188d263db93ce9a9ad5540586b559657f
GitOrigin-RevId: 480d556a8ab9cde4a9893a351d4356e55266a0df
Change-Id: Ia95271dc4e7d0e6faaec671b5cedcaca3ab79347

androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx