Update Enum Grammar for Attribute Support (#314)

[Muppetsg2]

Resolves #314

This PR updates the C++ grammar to correctly align with the standard regarding attribute positioning:

• Enum Headers: Moved attribute support to the correct position (after enum class/struct but before the identifier) (C++11).
• Enumerators: Added support for attributes on individual enum constants (C++17).
• Security & Dependencies:
  • Updated tree-sitter-c to ensure core grammar stability.
  • Bumped eslint to the latest version to resolve known security vulnerabilities.
• Testing: Introduced new test cases covering various enum attribute configurations to prevent regressions.

The grammar now correctly parses:

enum class [[maybe_unused]] MyEnum { 
  Value [[deprecated]] 
};