Use @boolean for true and false in highlights (#25338)

Release Notes:

- Fixed issue where `true` and `false` were highlighted as constants,
ignoring the `boolean` highlight defined in themes.
  - This fix applies to: C, C++, Go, JSON, JSONC, Python, and Rust.

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>

crates/languages/src/python/highlights.scm

@@ -95,9 +95,12 @@
 ; Literals
 
 [
-  (none)
   (true)
   (false)
+] @boolean
+
+[
+  (none)
   (ellipsis)
 ] @constant.builtin