Merge #674

674: Remove bitrotted patch image r=Smittyvb a=Smittyvb

The `patch` Docker image hasn't been successfully built for 8 months, and the job to build it always fails due to an authentication error. Even if it got past that issue, it would still fail since it's still using pgx 0.2.

This PR removes the image and the CI job that builds it.

(originally noted at #664 (comment))

Co-authored-by: Smitty <[email protected]>