MNT: (deps): Bump zeep from 4.1.0 to 4.3.1 in /ci

Bumps [zeep](https://github.com/mvantellingen/python-zeep) from 4.1.0 to 4.3.1.
- [Release notes](https://github.com/mvantellingen/python-zeep/releases)
- [Changelog](https://github.com/mvantellingen/python-zeep/blob/main/CHANGES)
- [Commits](mvantellingen/python-zeep@4.1.0...4.3.1)

---
updated-dependencies:
- dependency-name: zeep
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

ci/requirements.txt

@@ -4,5 +4,5 @@ numpy==1.23.4
 pandas==1.5.1
 pyyaml==6.0
 netcdf4==1.6.0
-zeep==4.1.0
+zeep==4.3.1
 cmocean==2.0