Update clap requirement from 2.33.1 to 4.1.6

Updates the requirements on [clap](https://github.com/clap-rs/clap) to permit the latest version.
- [Release notes](https://github.com/clap-rs/clap/releases)
- [Changelog](https://github.com/clap-rs/clap/blob/master/CHANGELOG.md)
- [Commits](clap-rs/clap@clap_generate-v3.0.0-rc.0...v4.1.6)

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

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

Author: dependabot[bot]

server/Cargo.toml

@@ -12,7 +12,7 @@ handlers = { path = "../handlers" }
 actix = "0.10.0" # Actor communication between handlers and Git
 actix-rt = "1.1.1" # Actix macros
 actix-web = "3.0.2" # Web framework
-clap = "2.33.1" # CLI argument parsing
+clap = "4.1.6" # CLI argument parsing
 env_logger = "0.7.1" # Configure logging level with env variables
 log = "0.4.11" # Logging facade
 serde = "1.0.114" # Serialisation of results