Update pycparser to 2.23

[pyup-bot]

This PR updates pycparser from 2.19 to 2.23.

Changelog

2.21

- Much improved support for C11 (multiple PRs)
- Support for parehthesized compount statements (423)
- Support for modern Python versions (3.9 and 3.10)
- Fix support for structs with nested enums (387)
- Multiple small bug fixes

2.20

- 61: Fix slow backtracking when parsing strings.
- 99: Parser for FuncDecl incorrectly sets declname attribute on return type.
- 310: Fix crash when file starts with a semicolon.
- 313: Fix array type generation.
- 314: Fix failed parsing of unnamed function parameters with array dim
 qualifiers.
- 315: Fix pointer type generation.
- 324: Fixes for u/l constant integer suffix.
- 346: Fix error transforming an empty switch.
- 350: Recognize integer multicharacter constants like 'ABCD'.
- 363: Fix incorrect AST when parsing offsetof.

Links

• PyPI: https://pypi.org/project/pycparser
• Changelog: https://data.safetycli.com/changelogs/pycparser/
• Repo: https://github.com/eliben/pycparser

[pyup-bot]

Closing this in favor of #620