Update github.com/bufbuild/protoplugin digest to 25d1d28

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/bufbuild/protoplugin	require	digest	750e09c → 25d1d28

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[stefanvanburen]

These would be removed by a go mod tidy. Feels like:

a. renovate should do this itself...
b. we ought to have caught this in CI with a checkgenerate step or similar

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[stefanvanburen]

@anuraaga might be best to review commit-by-commit, but since I noticed the go mod tidy thing wasn't being caught in CI, I added a step for that, and then shuffled the CI steps around a little bit so that we catch the quicker issues earlier in the run, and then lastly moved the buf dep to pypi since it seems like we were missing the cache on go run ...buf.