Update mysqlclient-sys requirement from 0.2.5 to 0.3.1

Updates the requirements on [mysqlclient-sys](https://github.com/sgrif/mysqlclient-sys) to permit the latest version.
- [Release notes](https://github.com/sgrif/mysqlclient-sys/releases)
- [Changelog](https://github.com/sgrif/mysqlclient-sys/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sgrif/mysqlclient-sys/commits)

---
updated-dependencies:
- dependency-name: mysqlclient-sys
  dependency-type: direct:production
...

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

helper/Cargo.toml

@@ -7,7 +7,7 @@ publish = false
 
 [dependencies]
 argh = "0.1.12"
-mysqlclient-sys = "0.2.5"
+mysqlclient-sys = "0.3.1"
 diesel = { version = "2.1.0", features = ["r2d2", "mysql", "chrono", "uuid", "serde_json"] }
 chrono = { version = "0.4", default-features = false, features = ["serde", "clock"] }
 dotenvy = "0.15"

nvd-server/Cargo.toml

@@ -17,7 +17,7 @@ actix-session = { version = "0.9.0", features = ["cookie-session"] }
 openssl = { version = "0.10", features = ["vendored"] }
 actix-files = "0.6.2"
 actix-cors = "0.7.0"
-mysqlclient-sys = "0.2.5"
+mysqlclient-sys = "0.3.1"
 thiserror = "1.0"
 env_logger = "0.11.1"
 utoipa = { version = "4.2.0", features = ["actix_extras", "chrono", "uuid", "openapi_extensions"], optional = true }