feat: add tclsh, wish, and expect shebang detection for Tcl syntax

Add first_line_match to the Tcl syntax definition via a patch file,
enabling automatic Tcl highlighting for scripts with tclsh, wish,
or expect shebangs.

Fixes #3513

CHANGELOG.md

@@ -9,6 +9,7 @@
 ## Features
 
 - Preserve `--diff` change markers and snip separators when `--plain` is set. Closes #3630, see #3643 (@mvanhorn)
+- Add shebang-based detection for Tcl (`tclsh`, `wish`) and Expect (`expect`) scripts, see #3513 (@mvanhorn)
 - Added support for `hidden_file_extensions` from `.sublime-syntax` files, see #3613 (@Matei02355)
 - Add word wrapping mode via `--wrap=word`, see #3597 (@veeceey)
 - Support configuring `--terminal-width` via `BAT_WIDTH`, see #3679 (@officialasishkumar)