build

Bump DeterminateSystems/magic-nix-cache-action from 8 to 9 #954

Job	Run time
Check and format all cabal files	4s
Generate matrix from cabal	3s
Run fourmolu	8s
Nix Flake (ubuntu-latest)	27s
Nix Flake (macos-latest)	32s
Run hlint	9s
Haskell GHC 9.2 cabal	4m 33s
Haskell GHC 9.4 cabal	5m 45s
Haskell GHC 9.6 cabal	5m 22s
Haskell GHC 9.8 cabal	5m 38s
Haskell GHC 9.10 cabal	4m 26s
Nix Flake Develop	0s
Successfully build and test on all systems	0s
	27m 7s

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