Equivalence failure in System.FilePath.Windows.normalise

[hasufell]

https://github.com/haskell/filepath/actions/runs/4211943241/jobs/7310618249#step:5:220

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filepath-1.4.100.0:

ghci> W.normalise "//."
"\\\\.\\"

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filepath-1.4.2.2:

ghci> W.normalise "//."
"\\\\."