Update getrandom requirement from 0.2.7 to 0.3.0

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@v0.2.7...v0.3.0)

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

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

Cargo.toml

@@ -45,7 +45,7 @@ async-channel = "2.0.0"
 async-net = "2.0.0"
 blocking = "1"
 criterion = { version = "0.4", default-features = false, features = ["cargo_bench_support"] }
-getrandom = "0.2.7"
+getrandom = "0.3.0"
 signal-hook = "0.3"
 tempfile = "3"