Make ghc-source-gen compatible with GHC 9.10

[wavewave]

Adjusted with all the new API changes.

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[blackgnezdo]

@wavewave thanks for the change!

Do you mind updating the CI system? It's been a while since anybody contributes non-trivial changes, so our CI bitrotted. If you don'h a favorite one, feel free to steal from e.g. google/proto-lens

[wavewave]

@blackgnezdo : yes, I will try to fix it. :-)

[blackgnezdo]

@jinwoo do you happen to be capable of approving this to get the workflow going?

[jinwoo]

@blackgnezdo Looks like I can. But some tests are failing.

[jinwoo]

All tests seem to have passed now. @blackgnezdo Do you think it's okay to merge this?

[blackgnezdo]

Thanks @wavewave!

Some nits to fix up before we can merge this.

[blackgnezdo]

@jinwoo this looks pretty good to me now, WDYT?

[jinwoo]

Some tests seem to fail. I'll merge once they are fixed.

[jinwoo]

All tests have passed. I'm merging now. Thanks, @wavewave and @blackgnezdo !