Bump enum-iterator from 0.6.0 to 0.7.0 in /enums

Bumps [enum-iterator](https://github.com/stephaneyfx/enum-iterator) from 0.6.0 to 0.7.0.
- [Release notes](https://github.com/stephaneyfx/enum-iterator/releases)
- [Commits](stephaneyfx/enum-iterator@0.6.0...0.7.0)

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

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

Author: dependabot[bot]

enums/Cargo.lock

@@ -5,7 +5,7 @@ authors = ["Calixte Denizet <cdenizet@mozilla.com>"]
 edition = "2018"
 
 [dependencies]
-enum-iterator = "^0.6"
+enum-iterator = "^0.7"
 clap = "^2.33"
 askama = "^0.10"
 phf_codegen = "^0.8"