build(deps): update magnus requirement from 0.6 to 0.7 in /bindings/ruby

Updates the requirements on [magnus](https://github.com/matsadler/magnus) to permit the latest version.
- [Release notes](https://github.com/matsadler/magnus/releases)
- [Changelog](https://github.com/matsadler/magnus/blob/main/CHANGELOG.md)
- [Commits](matsadler/magnus@0.6.0...0.7.1)

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

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

Author: dependabot[bot]

bindings/ruby/ext/css_inline/Cargo.toml

@@ -16,7 +16,7 @@ name = "css_inline"
 crate-type = ["cdylib"]
 
 [dependencies]
-magnus = "0.6"
+magnus = "0.7"
 rayon = "1"
 
 [dependencies.css-inline]