build(deps): bump nix from 0.28.0 to 0.29.0 in /examples/rust

Bumps [nix](https://github.com/nix-rust/nix) from 0.28.0 to 0.29.0.
- [Changelog](https://github.com/nix-rust/nix/blob/master/CHANGELOG.md)
- [Commits](nix-rust/nix@v0.28.0...v0.29.0)

---
updated-dependencies:
- dependency-name: nix
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

examples/rust/Cargo.lock

@@ -11,7 +11,7 @@ blazesym = { path = "../../../blazesym", features = ["tracing"] }
 clap = { version = "4.5", features = ["derive"] }
 libbpf-rs = "0.24"
 libc = "*"
-nix = "0.28.0"
+nix = "0.29.0"
 tracing = "0.1"
 tracing-subscriber = {version = "0.3", features = ["ansi", "env-filter", "fmt"]}