Crash with swiftlint directive after emoji with skin tone

[KeithBauerANZ]

New Issue Checklist

• I've Updated SwiftLint to the latest version.
• I've searched for existing GitHub issues.

Bug Description

This crashes swiftlint:

"🤵🏼‍♀️" // swiftlint:disable:this nonexistent_rule

(whether the rule exists or not isn't relevant, only the directive following the emoji on the same line)

The crash is here:

https://github.com/realm/SwiftLint/blob/main/Source/SwiftLintCore/Extensions/String%2BSwiftLint.swift#L31

(My swiftlint doesn't have debug info, so the backtrace is useless, but that's the assertion message)

Just without any config at all:

$ swiftlint test.swift

Environment

• SwiftLint version (run swiftlint version to be sure)
  0.57.1

• Xcode version (run xcodebuild -version to be sure)
  Xcode 16.2
  Build version 16C5032a

• Installation method used (Homebrew, CocoaPods, building from source, etc)
  Downloaded from release tag

• Configuration file:
  n/a

[KeithBauerANZ]

(This is a regression since 0.51.0)