Bump ruamel-yaml from 0.17.21 to 0.18.7 (#2284)

Bumps ruamel-yaml from 0.17.21 to 0.18.7.

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

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

Author: dependabot[bot]

requirements.txt

@@ -22,7 +22,7 @@ meetup-api==0.1.1
 urllib3[secure]==2.2.3
 yamale==4.0.4
 markdown==3.3.6
-ruamel.yaml==0.17.21
+ruamel.yaml==0.18.7
 lxml==4.8.0
 # For emoji
 sphinxemoji==0.2.0