Bump rustls from 0.20.9 to 0.21.12

Bumps [rustls](https://github.com/rustls/rustls) from 0.20.9 to 0.21.12.
- [Release notes](https://github.com/rustls/rustls/releases)
- [Changelog](https://github.com/rustls/rustls/blob/main/CHANGELOG.md)
- [Commits](rustls/rustls@v/0.20.9...v/0.21.12)

---
updated-dependencies:
- dependency-name: rustls
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Cargo.toml

@@ -48,7 +48,7 @@ nanoid = "0.4"
 percent-encoding = "2"
 port_check = "0.2"
 regex = "1"
-rustls = { version = "0.20", optional = true }
+rustls = { version = "0.21", optional = true }
 rustls-pemfile = { version = "1.0", optional = true }
 serde = { version = "1", features = ["derive"] }
 sha2 = "0.10"