Fix Kotlin parser failure to handle value classes

[gonzojive]

This works around fwcd/tree-sitter-kotlin#102.

Fixes #530

Type of change

• Bug fix (change which fixes an issue)

For changes visible to end-users

• Breaking change (this change will force users to change their own code or config)
• Relevant documentation has been updated
• Suggested release notes are provided below:

Kotlin gazelle plugin uses improved Kotlin parser with value class support.

Test plan

• New test cases added

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✅ gonzojive
❌ reddaly
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