Bump pycparser from 2.20 to 2.21

[dependabot[bot]]

Bumps pycparser from 2.20 to 2.21.

Changelog

Sourced from pycparser's changelog.

• Version 2.21 (2021.11.06)

  • 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

Commits

• 3cf6bf5 Update TODO to mention bdist_wheel
• 7593f34 Update TODO with distribution testing instructions
• b400c00 Preparation for releasing 2.21
• f19cd14 Don't run cpp/gcc-needing tests on Darwin: not all Macs have the tools
• 268067b Only run example tests on Linux, since many require cpp
• 43997f1 Try to make func_calls example pass on all platforms with no arguments
• 7beef72 Add test that runs all examples and makes sure they don't crash
• 615317a Merge branch 'master' of github.com:eliben/pycparser
• 50dac81 Clarify README w.r.t. C11 support in fake headers
• a7b480c Fix typos (#443)
• Additional commits viewable in compare view

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