chore(deps): Update getrandom requirement from 0.2.9 to 0.4.0

Updates the requirements on [getrandom](https://github.com/rust-random/getrandom) to permit the latest version.
- [Changelog](https://github.com/rust-random/getrandom/blob/master/CHANGELOG.md)
- [Commits](rust-random/getrandom@v0.2.9...v0.4.0)

---
updated-dependencies:
- dependency-name: getrandom
  dependency-version: 0.4.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.toml

@@ -18,7 +18,7 @@ async-signature = "0.5.1"
 ed25519-dalek = { version = "2.1", features = ["rand_core", "serde"] }
 env_logger = "0.11.8"
 futures = "0.3.31"
-getrandom = "0.2.9"
+getrandom = "0.4.0"
 ipld-core = { version = "0.4.2", features = ["arb", "serde"] }
 nom = "8.0"
 nom-unicode = "0.4"