chore(deps)(deps): Bump the shared-dependencies group

Bumps the shared-dependencies group in /shared with 2 updates: [pydantic](https://github.com/pydantic/pydantic) and [python-dateutil](https://github.com/dateutil/dateutil).


Updates `pydantic` from 2.5.3 to 2.12.5
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/main/HISTORY.md)
- [Commits](pydantic/pydantic@v2.5.3...v2.12.5)

Updates `python-dateutil` from 2.8.2 to 2.9.0.post0
- [Release notes](https://github.com/dateutil/dateutil/releases)
- [Changelog](https://github.com/dateutil/dateutil/blob/master/NEWS)
- [Commits](dateutil/dateutil@2.8.2...2.9.0.post0)

---
updated-dependencies:
- dependency-name: pydantic
  dependency-version: 2.12.5
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: shared-dependencies
- dependency-name: python-dateutil
  dependency-version: 2.9.0.post0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: shared-dependencies
...

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

Author: dependabot[bot]

shared/requirements.txt

@@ -1,3 +1,3 @@
 # Shared dependencies between client and server
-pydantic==2.5.3
-python-dateutil==2.8.2
+pydantic==2.12.5
+python-dateutil==2.9.0.post0