build(deps-dev): Bump splunk-add-on-ucc-framework from 5.10.1 to 5.28.6

Bumps [splunk-add-on-ucc-framework](https://github.com/splunk/addonfactory-ucc-generator) from 5.10.1 to 5.28.6.
- [Release notes](https://github.com/splunk/addonfactory-ucc-generator/releases)
- [Changelog](https://github.com/splunk/addonfactory-ucc-generator/blob/main/docs/CHANGELOG.md)
- [Commits](splunk/addonfactory-ucc-generator@v5.10.1...v5.28.6)

---
updated-dependencies:
- dependency-name: splunk-add-on-ucc-framework
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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