build(deps): bump hex_color from 2.0.0 to 2.1.0

Bumps [hex_color](https://github.com/seancroach/hex_color) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/seancroach/hex_color/releases)
- [Commits](seancroach/hex_color@v2.0.0...v2.1.0)

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

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

Cargo.toml

@@ -20,7 +20,7 @@ yew = { version = "0.21", features = ["csr"] }
 yew-router = "0.18"
 stylist = { version = "0.13", features = ["yew_integration"] }
 themer = { git = "https://github.com/simbleau/themer", version = "0.3" }
-hex_color = "2.0"
+hex_color = "2.1"
 url = "2.4"
 wasm-bindgen = "0.2"
 gloo-utils = "0.2"