build(deps): Update tree-sitter to 0.26.3 and related dependencies

[marlon-costa-dc]

Summary

Update major dependencies to their latest versions:

• tree-sitter: 0.25.3 → 0.26.3
• tree-sitter-javascript: 0.23.1 → 0.25.0
• tree-sitter-python: 0.23.6 → 0.25.0
• tree-sitter-rust: 0.23.2 → 0.24.0
• askama: 0.14 → 0.15

Also updates tree-sitter version in all subcrates (tree-sitter-preproc, tree-sitter-ccomment, tree-sitter-mozcpp, tree-sitter-mozjs).

Changes

1. Cargo.toml updates - Main crate and enums crate dependencies
2. Subcrate Cargo.toml updates - dev-dependencies for tree-sitter
3. Regenerated language enums - Using updated tree-sitter grammars
4. API adaptation - Node.child() now takes u32 instead of usize in tree-sitter 0.26
5. Clippy fixes - Fixed collapsible_if and lifetime elision warnings

Testing

• ✅ cargo check passes
• ✅ cargo clippy -- -D warnings passes
• ✅ All tests pass

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This PR is part of splitting #1206 into separate focused PRs as requested.