Bump socket2 from 0.3.11 to 0.3.12 (#9222)

Bumps [socket2](https://github.com/alexcrichton/socket2-rs) from 0.3.11 to 0.3.12.
- [Release notes](https://github.com/alexcrichton/socket2-rs/releases)
- [Commits](https://github.com/alexcrichton/socket2-rs/compare/0.3.11...0.3.12)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

net-utils/Cargo.toml

@@ -17,7 +17,7 @@ nix = "0.17.0"
 rand = "0.6.1"
 serde = "1.0.105"
 serde_derive = "1.0.103"
-socket2 = "0.3.11"
+socket2 = "0.3.12"
 solana-clap-utils = { path = "../clap-utils", version = "1.2.0" }
 solana-logger = { path = "../logger", version = "1.2.0" }
 tokio = "0.1"