build(deps): bump .git_submodules/alacritty-theme (#81)

Bumps [.git_submodules/alacritty-theme](https://github.com/alacritty/alacritty-theme) from `90a8406` to `6448180`.
- [Commits](alacritty/alacritty-theme@90a8406...6448180)

---
updated-dependencies:
- dependency-name: ".git_submodules/alacritty-theme"
  dependency-type: direct:production
...

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