build(deps): Update pycparser requirement from 2.21 to 2.22

Updates the requirements on [pycparser](https://github.com/eliben/pycparser) to permit the latest version.
- [Release notes](https://github.com/eliben/pycparser/releases)
- [Changelog](https://github.com/eliben/pycparser/blob/main/CHANGES)
- [Commits](eliben/pycparser@release_v2.21...release_v2.22)

---
updated-dependencies:
- dependency-name: pycparser
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -12,7 +12,7 @@ homepage = "https://github.com/atsign-foundation/at_python"
 python = "^3.8.1"
 cffi = "1.16.0"
 cryptography = "42.0.5"
-pycparser = "2.21"
+pycparser = "2.22"
 python-dateutil = "2.9.0.post0"
 requests = "2.31.0"
 six = "1.16.0"