Bumps `karaf.version` from 4.4.6 to 4.4.9.

Updates `org.apache.karaf.features:framework` from 4.4.6 to 4.4.9

Updates `org.apache.karaf.features:standard` from 4.4.6 to 4.4.9

---
updated-dependencies:
- dependency-name: org.apache.karaf.features:framework
  dependency-version: 4.4.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.apache.karaf.features:standard
  dependency-version: 4.4.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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