chore: Add GHC 9.6.5

[OlaoluwaM]

Due to some segfault issues when running make build in text-assets, I had to bump up the text-assets GHC version to 9.6.5 (LTS 22.21). This PR adds support for GHC 9.6.5 to the weeder GitHub action

The issues in question were often:

make: *** [build] Bus error: 10

and less often:

text-assets: internal error: ARR_WORDS object (0x16e4f2e40) entered!
    (GHC version 9.6.3 for aarch64_apple_darwin)
    Please report this as a GHC bug:  https://www.haskell.org/ghc/reportabug
make: *** [build] Abort trap: 6

[pbrisbin]

Looks like you drew the short straw, and will have to fix the macOS builds for the new runners lacking a stack install. Let me know if you need more context or support.

[OlaoluwaM]

So it looks like Haskell development tools (ie stack) were purposefully removed to streamline macos images: actions/runner-images#9242 @pbrisbin. Sounds like we'll need to install it ourselves. How do I go about doing that?

[pbrisbin]

Yeah, it's a shame that URL is the link everyone finds and it doesn't include the fix. I just commented there with the snippet I've been using.

[chris-martin]

If the checks are happy, so am I