ruby: Update tree-sitter grammar version (#13216)

Hi, this pull request just updates the `tree-sitter` version for the
Ruby language. I checked the changelog and it doesn't contain breaking
changes. Thanks.

tree-sitter/tree-sitter-ruby@9d86f3761bb3 ->
tree-sitter/tree-sitter-ruby@dc2d7d6b50f9


Release Notes:

- N/A