Bump dependencies and CI

[andreasabel]

• include latest GHCs in CI
• latest minor version is determined by haskell-actions/setup
• freeze file is a bad cache key as it contains a time stamp, use the build plan instead (the correct choice)

Successful CI run at: https://github.com/andreasabel/Haxl/actions/runs/6725224644

[andreasabel]

@simonmar : PR ready

[josefs]

Hi @andreasabel ! Thanks for the patch! Unfortunately it looks like it's broken for 9.4.

[andreasabel]

@josefs: Thanks for taking a look!

Seems like this test breaks on 9.4: https://github.com/facebook/Haxl/actions/runs/6725225214/job/18629935821?pr=158#step:8:150

:OutgoneFetchesTest:
  :finished: [Failed]
fetchesMap
expected: fromList []
 but got: fromList [("Sleep",fromList [(ConcurrentIOReq Sleep,1)])]

Here is the source: https://github.com/facebook/Haxl/blob/6cd30c084debcde9bb83e0f517bbe98cdd80e945/tests/OutgoneFetchesTests.hs#L40-L58

I can see timeouts and sleeps here...

Let me boldly claim that nothing is wrong with my PR but something is wrong with this test...