Bump rack-cors from 1.1.1 to 2.0.2

Bumps [rack-cors](https://github.com/cyu/rack-cors) from 1.1.1 to 2.0.2.
- [Changelog](https://github.com/cyu/rack-cors/blob/master/CHANGELOG.md)
- [Commits](cyu/rack-cors@v1.1.1...v2.0.2)

---
updated-dependencies:
- dependency-name: rack-cors
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Gemfile.lock

@@ -346,7 +346,7 @@ GEM
       nio4r (~> 2.0)
     racc (1.8.0)
     rack (2.2.9)
-    rack-cors (1.1.1)
+    rack-cors (2.0.2)
       rack (>= 2.0.0)
     rack-livereload (0.3.17)
       rack