Bump rack-cors from 1.0.3 to 1.0.5

Bumps [rack-cors](https://github.com/cyu/rack-cors) from 1.0.3 to 1.0.5.
- [Release notes](https://github.com/cyu/rack-cors/releases)
- [Changelog](https://github.com/cyu/rack-cors/blob/master/CHANGELOG.md)
- [Commits](cyu/rack-cors@v1.0.3...v1.0.5)

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

Gemfile.lock

@@ -262,7 +262,8 @@ GEM
     pundit (2.1.0)
       activesupport (>= 3.0.0)
     rack (2.0.7)
-    rack-cors (1.0.3)
+    rack-cors (1.0.5)
+      rack (>= 1.6.0)
     rack-proxy (0.6.5)
       rack
     rack-test (1.1.0)