Bumping to SwiftSyntax 600.0.1

[mobrien-ghost]

• Bumps to latest SwiftSyntax version tag
• Updates throws specifier to use updated throwsClause.throwsSpecifier
• Adds isKeywordPresent variable to Function declaration type
  • Dependency update now counts some code block invocations as function declarations. This may be an issue, however, there is a presence property on the funcKeyword which will at least provide consumers some means of filtering easier.
• Moves inout logic to SyntaxChildren+InOut for convenience/re-use
  • Updates inout assessment to account for now used TypeSpecifierListSyntax and child TypeSpecifierListSyntax that came with dependency update.
  • Falls back to existing behavior
• Updates swift package manifests