Does not compile with ghc-9.12

[erikd]

This package does not compile with ghc-9.12 due to its dependency (specifically ghc-spurce-gen, via proto-lens*) not compiling with ghc-9.12.

See: google/ghc-source-gen#122

[edsko]

Thanks for the heads up @erikd . I'll keep an eye on the upstream tickets (ghc-source-gen and proto-lens).