Bump ruamel-yaml from 0.17.35 to 0.17.40

Bumps [ruamel-yaml](https://sourceforge.net/p/ruamel-yaml/code/ci/default/tree) from 0.17.35 to 0.17.40.

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

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

requirements.txt

@@ -5,7 +5,7 @@ influxdb>=2.12.0
 networkx>=1.9
 pbr>=1.9
 prometheus_client==0.17.1
-ruamel.yaml==0.17.35
+ruamel.yaml==0.17.40
 os_ken==2.6.0
 beka==0.4.2
 pytricia>=1.0.0