Bump ruamel-yaml from 0.18.15 to 0.18.16

Bumps ruamel-yaml from 0.18.15 to 0.18.16.

---
updated-dependencies:
- dependency-name: ruamel-yaml
  dependency-version: 0.18.16
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -76,7 +76,7 @@ requests-oauthlib==2.0.0
     # via kubernetes
 rsa==4.9.1
     # via google-auth
-ruamel-yaml==0.18.15
+ruamel-yaml==0.18.16
     # via chartpress
 ruamel-yaml-clib==0.2.14
     # via ruamel-yaml