bump powerlevel10k from 17cd9e3 to b973805 (#859)

Bumps [custom/themes/powerlevel10k](https://github.com/romkatv/powerlevel10k) from `17cd9e3` to `b973805`.
- [Release notes](https://github.com/romkatv/powerlevel10k/releases)
- [Commits](romkatv/powerlevel10k@17cd9e3...b973805)

---
updated-dependencies:
- dependency-name: custom/themes/powerlevel10k
  dependency-type: direct:production
...

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