chore(mypy): Remove unused ignore_missing_imports overrides

why: Bundled extension modules are now provided by PyPI packages.
what:
- Remove mypy overrides for sphinx_fonts, cli_usage_lexer, and related modules

Author: tony

pyproject.toml

@@ -145,12 +145,6 @@ strict = true
 [[tool.mypy.overrides]]
 module = [
   "shtab",
-  "sphinx_argparse_neo",
-  "sphinx_argparse_neo.*",
-  "sphinx_fonts",
-  "cli_usage_lexer",
-  "argparse_lexer",
-  "argparse_roles",
   "docutils",
   "docutils.*",
   "pygments",