pip prod(deps): update packaging requirement from <25.1 to <26.1

Updates the requirements on [packaging](https://github.com/pypa/packaging) to permit the latest version.
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/main/CHANGELOG.rst)
- [Commits](pypa/packaging@14.0...26.0)

---
updated-dependencies:
- dependency-name: packaging
  dependency-version: '26.0'
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -7,4 +7,4 @@ cgen>=2020.1,<2026
 codepy>=2019.1,<2025
 multidict<6.3
 anytree>=2.4.3,<=2.13.0
-packaging<25.1
+packaging<26.1