closure_spacing false positive when using Swift Regex literals involving brackets

[JonathanDowning]

New Issue Checklist

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

Describe the bug

SwiftLint erroneously raises a closure_spacing warning when using the new Swift Regex literal syntax which includes an opening and closing bracket.

let r = /\{\}/ // ⚠️ Closure Spacing Violation: Closure expressions should have a single space inside each brace. (closure_spacing)

Complete output when running SwiftLint, including the stack trace and command used

$ swiftlint
main.swift:1:10: warning: Closure Spacing Violation: Closure expressions should have a single space inside each brace. (closure_spacing)

Environment

• SwiftLint version (run swiftlint version to be sure)? 0.47.1
• Installation method used (Homebrew, CocoaPods, building from source, etc)? Homebrew
• Paste your configuration file:

only_rules
  - closure_spacing

• Are you using nested configurations? No
• Which Xcode version are you using (check xcodebuild -version)? Build version 14A5294e
• Do you have a sample that shows the issue?

echo "let r = /\{\}/" | swiftlint lint --no-cache --use-stdin --enable-all-rules

[jpsim]

Fixed in #4092.