Update parking_lot requirement from 0.9.0 to 0.10.0

Updates the requirements on [parking_lot](https://github.com/Amanieu/parking_lot) to permit the latest version.
- [Release notes](https://github.com/Amanieu/parking_lot/releases)
- [Changelog](https://github.com/Amanieu/parking_lot/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Amanieu/parking_lot/compare/0.9.0...0.10.0)

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

Cargo.toml

@@ -27,7 +27,7 @@ jemallocator = "0.3.2"
 libsodium-sys-stable="1.18.2"
 log = { version = "0.4.8", features = ["std", "release_max_level_debug"] }
 net2 = "0.2.33"
-parking_lot = "0.9.0"
+parking_lot = "0.10.0"
 privdrop = "0.3.3"
 rand = "0.7.2"
 rustc-hash = "1"