Add Swift 5.9 support

[Gaziav1]

Cannot install last version of Swiftlint 0.54.0 because mint does not support Swift 5.9

[yonaskolb]

I'm not seeing this error on my system (M1, Sonoma 14.1.1, Xcode 15.2)

mint install realm/swiftlint
🌱 Finding latest version of swiftlint
🌱 Cloning swiftlint 0.54.0
🌱 Resolving package
🌱 Building package
🌱 Installed swiftlint 0.54.0
🌱 Linked swiftlint 0.54.0 to /Users/yonas/.mint/bin, replacing version 0.50.1

I'll update the Swift version anyway though

[crane-hiromu]

I have a same issue.

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M2 Mac pro
Venture 13.6
Xcode 15.2
mint 0.17.5

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Several similar issues are reported below.
realm/SwiftLint#5348