deps(deps): bump rand_core from 0.6.4 to 0.9.3

Bumps [rand_core](https://github.com/rust-random/rand) from 0.6.4 to 0.9.3.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-random/rand/commits)

---
updated-dependencies:
- dependency-name: rand_core
  dependency-version: 0.9.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -28,5 +28,5 @@ zerocopy = { version = "0.8", features = ["derive"] }
 zeroize = { version = "1.8", default-features = false, features = ["derive"] }
 subtle = { version = "2", default-features = false }
 # Pin to match Hubris ecosystem
-rand_core = { version = "0.6", default-features = false }
+rand_core = { version = "0.9", default-features = false }
 embedded-hal = "1.0"