Bump cmd2 from 2.5.7 to 2.5.11

Bumps [cmd2](https://github.com/python-cmd2/cmd2) from 2.5.7 to 2.5.11.
- [Release notes](https://github.com/python-cmd2/cmd2/releases)
- [Changelog](https://github.com/python-cmd2/cmd2/blob/master/CHANGELOG.md)
- [Commits](python-cmd2/cmd2@2.5.7...2.5.11)

---
updated-dependencies:
- dependency-name: cmd2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]