chore(deps): bump neovim-nightly-overlay from 80b1f16 to 4a27c9c (#172)

Bumps [neovim-nightly-overlay](https://github.com/nix-community/neovim-nightly-overlay) from `80b1f16` to `4a27c9c`.
- [Commits](nix-community/neovim-nightly-overlay@80b1f16...4a27c9c)

---
updated-dependencies:
- dependency-name: neovim-nightly-overlay
  dependency-version: 4a27c9c5416c624fc35ec0607a9f7ddeb59e7c99
  dependency-type: direct:production
...

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Author: dependabot[bot]