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

Bumps [.git_submodules/alacritty-theme](https://github.com/alacritty/alacritty-theme) from `83babff` to `c378fd7`.
- [Commits](alacritty/alacritty-theme@83babff...c378fd7)

---
updated-dependencies:
- dependency-name: ".git_submodules/alacritty-theme"
  dependency-version: c378fd7f31a202170b03427838a9f4a49ab746d7
  dependency-type: direct:production
...

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Author: dependabot[bot]