Update packaging requirement from <24.0,>=19.0 to >=19.0,<26.0 (#930)

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@19.0...25.0)

---
updated-dependencies:
- dependency-name: packaging
  dependency-version: '25.0'
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements/dev.txt

@@ -21,5 +21,5 @@ alibi-testing @ git+https://github.com/SeldonIO/alibi-testing@master#egg=alibi-t
 pre-commit>=1.20.0, <4.0.0
 tox>=3.21.0, <5.0.0 # used to generate licence info via `make licenses`
 twine>3.2.0, <5.0.0
-packaging>=19.0, <24.0 # Used to check scipy version for CVMDrift test. Can be removed once python 3.6 support dropped (and scipy lower bound >=1.7.0).
+packaging>=19.0, <26.0 # Used to check scipy version for CVMDrift test. Can be removed once python 3.6 support dropped (and scipy lower bound >=1.7.0).
 xgboost>=1.3.2, <3.0.0 # Install for use in testing since we support serialization of xgboost models under the sklearn API