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 sorry also please advance the versions in ansible/vars.yml one more than where they are at in develop branch please

[laurenceisla]

After testing in the instance, postgrest does not run due to the GLIBC version:

$ opt/postgrest --version
/opt/postgrest: /lib/aarch64-linux-gnu/libc.so.6: version `GLIBC_2.34' not found (required by /opt/postgrest)
/opt/postgrest: /lib/aarch64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by /opt/postgrest)
/opt/postgrest: /lib/aarch64-linux-gnu/libc.so.6: version `GLIBC_2.32' not found (required by /opt/postgrest)

[samrose]

@laurenceisla what is the version of glibc you need? 2.34?

[samrose]

...the version in the current release of ami is 2.31 fwiw

[laurenceisla]

We're bumping to PostgREST v13 directly. So this is superseded by #1685.