bump powerlevel10k from d39e426 to 6836bfe (#863)

Bumps [custom/themes/powerlevel10k](https://github.com/romkatv/powerlevel10k) from `d39e426` to `6836bfe`.
- [Release notes](https://github.com/romkatv/powerlevel10k/releases)
- [Commits](romkatv/powerlevel10k@d39e426...6836bfe)

---
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>