feat: bump PostgREST to v14.15

[laurenceisla]

What kind of change does this PR introduce?

Bumps PostgREST from v14.5 to v14.15

[laurenceisla]

The following tests are passing:

• Upgrade
• Engines
• Replication
• PITR

In the PITR tests, this one for x86 is failing after reruns: https://github.com/supabase/supadev/actions/runs/29370387549/job/87242082081. I see that all the other x86 tests are skipped except for this one, so could this be an oversight? I'm not sure about the exact error here.

[laurenceisla]

@dliappis I'd like your opinion on why this test is failing and if it's safe to ignore: #2208 (comment)

[dliappis]

@dliappis I'd like your opinion on why this test is failing and if it's safe to ignore: #2208 (comment)

@laurenceisla
Right. The explanation can be found in https://supabase.slack.com/archives/C02FHG9QQAF/p1784197124810979 and the comments https://linear.app/supabase/issue/RELENG-176/postgres-smoke-tests-deterministic-arch-coverage-x86-64arm64#comment-6d0418b4 / https://linear.app/supabase/issue/RELENG-176/postgres-smoke-tests-deterministic-arch-coverage-x86-64arm64#comment-dc6bd7b1

I noticed that you are using the master branch of supabase for running the tests. Instead, could you please use the supadev branch dliappis/feat/smoke-instance-type-pin (from my most recent PR that aims to improves the postgres smoke tests) to run pitr, or any other smoke test again? This is the the workflow using clickops:

For more details, and a way to run all the smoke tests via the gh cli in https://supabase.slack.com/archives/C02FHG9QQAF/p1784197154614069?thread_ts=1784197124.810979&cid=C02FHG9QQAF

[laurenceisla]

Thanks @dliappis! This is the list of the smoke tests, all green:

https://github.com/supabase/supadev/actions?query=actor%3Alaurenceisla+branch%3A%22dliappis%2Ffeat%2Fsmoke-instance-type-pin%22

I removed the test AMI suffix so it should be safe to merge now.