The --tree-size arg should always be an Integer

[issyl0]

Description

• Otherwise we can't >= tree_size further along in the chain.
• I tested this change by editing the local vendored files and it worked. This is hopefully my final change here. 😳

RepositoryLanguageAnalysisDependencyTest#test__includes_files_in_language__true_if_the_repo_contains_files_written_in_a_given_language_L90:
GitRPC::Error: git-linguist failed: wrong argument type String (expected Integer)
/workspaces/github/vendor/gems/3.3.1/ruby/3.3.0/gems/github-linguist-7.29.0.2.g32ae1b425/lib/linguist/repository.rb:137:in `count_recursive'

Checklist:

• I am adding new or changing current functionality
  • I have added or updated the tests for the new or changed functionality.