Does not build with `transformers-0.6.*` (GHC 9.6)

[RyanGlScott]

Currently, language-rust imposes upper version bounds of <0.6 on transformers:

language-rust/language-rust.cabal

Line 89 in 9d509c4

, transformers >=0.4 && <0.6

This prevents it from building with transformers-0.6.*. As this is the version of transformers that is bundled with GHC 9.6, this makes it difficult to build language-rust with GHC 9.6.

[RyanGlScott]

I've submitted #45 with a fix.