Bump the mycelium group with 3 updates

Bumps the mycelium group with 3 updates: [rustls](https://github.com/rustls/rustls), [nix](https://github.com/nix-rust/nix) and [axum](https://github.com/tokio-rs/axum).


Updates `rustls` from 0.23.26 to 0.23.27
- [Release notes](https://github.com/rustls/rustls/releases)
- [Changelog](https://github.com/rustls/rustls/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rustls/rustls/compare/v/0.23.26...v/0.23.27)

Updates `nix` from 0.29.0 to 0.30.1
- [Changelog](https://github.com/nix-rust/nix/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nix-rust/nix/compare/v0.29.0...v0.30.1)

Updates `axum` from 0.8.3 to 0.8.4
- [Release notes](https://github.com/tokio-rs/axum/releases)
- [Changelog](https://github.com/tokio-rs/axum/blob/main/CHANGELOG.md)
- [Commits](https://github.com/tokio-rs/axum/compare/axum-v0.8.3...axum-v0.8.4)

---
updated-dependencies:
- dependency-name: rustls
  dependency-version: 0.23.27
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: mycelium
- dependency-name: nix
  dependency-version: 0.30.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: mycelium
- dependency-name: axum
  dependency-version: 0.8.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: mycelium
...

Signed-off-by: dependabot[bot] <support@github.com>

mycelium-metrics/Cargo.toml

@@ -9,7 +9,7 @@ readme = "../README.md"
 prometheus = ["dep:axum", "dep:prometheus", "dep:tokio", "dep:tracing"]
 
 [dependencies]
-axum = { version = "0.8.3", default-features = false, optional = true, features = [
+axum = { version = "0.8.4", default-features = false, optional = true, features = [
   "http1",
   "http2",
   "tokio",