build(deps): update clap_lex requirement from =0.5.0 to =0.6.0

Updates the requirements on [clap_lex](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_lex-v0.5.0...clap_lex-v0.6.0)

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

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

kubert/Cargo.toml

@@ -144,7 +144,7 @@ chrono = { version = "0.4", optional = true, default-features = false }
 # dependency of clap, which we must take an explicit dep on to ensure that it's
 # pinned to the version before the MSRV became incompatible with what's in the
 # devcontainer.
-clap_lex = { version = "=0.5.0", optional = true }
+clap_lex = { version = "=0.6.0", optional = true }
 futures-core = { version = "0.3", optional = true, default-features = false }
 futures-util = { version = "0.3", optional = true, default-features = false }
 hyper = { version = "0.14.17", optional = true, default-features = false }