chore(nix): bump rust-overlay from 366ea19 to adf987c (#37)

Bumps [rust-overlay](https://github.com/oxalica/rust-overlay) from `366ea19` to `adf987c`.
- [Commits](oxalica/rust-overlay@366ea19...adf987c)

---
updated-dependencies:
- dependency-name: rust-overlay
  dependency-version: adf987c76af8d17b8256d23631bcf203f81e1a63
  dependency-type: direct:production
...

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