chore: bump to PostgREST v12.2.8

[laurenceisla]

Bumps PostgREST from v12.2.3 to v12.2.8 (patch release).

Adds some bug fixes like JWT cache not removing expired entries and showing 503 HTTP errors in the logs (useful for support using Logflare).

[samrose]

@laurenceisla wanted to let you know the convention for pull requests to supabase/postgres is to clone this repo, create a branch, and push the branch to this repo. This project is not set up to work with changes where someone forked this repo.

[laurenceisla]

the convention for pull requests to supabase/postgres is to clone this repo, create a branch, and push the branch to this repo. This project is not set up to work with changes where someone forked this repo.

Oh, sorry about that, I'll open a new PR accordingly. Thanks for the info.