collab: Increase `DATABASE_MAX_CONNECTIONS` for Collab server (#35818)

This PR increases the `DATABASE_MAX_CONNECTIONS` limit for the Collab
server to 850 (up from 250).

Release Notes:

- N/A

Co-authored-by: Nathan <nathan@zed.dev>
Co-authored-by: Mikayla <mikayla@zed.dev>
fa2ff3ce1cMarshall Bowers committed on 8/7/2025, 5:26:08 PM· committed by GitHubparentc1d1d1c
2 files changedLine totals unavailable