Bump packaging from 21.3 to 23.1 (#341)

Bumps [packaging](https://github.com/pypa/packaging) from 21.3 to 23.1.
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pypa/packaging/compare/21.3...23.1)

---
updated-dependencies:
- dependency-name: packaging
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Pipfile

@@ -58,7 +58,7 @@ werkzeug = "~=2.3"
 # gds metrics packages
 prometheus-client = "==0.14.1"
 gds-metrics = {version = "==0.2.4", ref = "6f1840a57b6fb1ee40b7e84f2f18ec229de8aa72", git = "https://github.com/alphagov/gds_metrics_python.git"}
-packaging = "==21.3"
+packaging = "==23.1"
 notifications-utils = {editable = true, ref = "main", git = "https://github.com/GSA/notifications-utils.git"}
 newrelic = "*"