MNT: (deps): Bump pyyaml from 6.0 to 6.0.2 in /ci

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 6.0 to 6.0.2.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/main/CHANGES)
- [Commits](yaml/pyyaml@6.0...6.0.2)

---
updated-dependencies:
- dependency-name: pyyaml
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

ci/requirements.txt

@@ -2,7 +2,7 @@
 matplotlib==3.6.1
 numpy==1.23.4
 pandas==1.5.1
-pyyaml==6.0
+pyyaml==6.0.2
 netcdf4==1.6.0
 zeep==4.1.0
 cmocean==2.0