Merge branch 'deprecation-os-string'

.github/workflows/test.yaml

System/OsPath/Data/ByteString/Short.hs

System/OsPath/Data/ByteString/Short/Internal.hs

System/OsPath/Data/ByteString/Short/Word16.hs

System/OsPath/Encoding/Internal.hs

System/OsString.hs

System/OsString/Common.hs

System/OsString/Internal.hs

System/OsString/Internal/Types.hs

System/OsString/Types.hs

changelog.md

filepath.cabal