Replace the local `ty` hook with the official Astral hook

[paddyroddy]

Is Your Feature Request Related to a Problem? Please Describe

I've added the https://github.com/narumiruna/ty-pre-commit hook so we can benefit from ty sooner. We should replace it with the official hook when it is available.

Describe the Solution You'd Like

No response

Describe Alternatives You've Considered

No response

Additional Context

No response

[paddyroddy]

Turns out any hook or local hook seems to fail, so will close this

[paddyroddy]

Re-opening as now using a local hook in #926.

Need to remove the skip line in CI too.