Bump rack from 2.2.6.2 to 2.2.6.3 (#35)

Bumps [rack](https://github.com/rack/rack) from 2.2.6.2 to 2.2.6.3.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v2.2.6.2...v2.2.6.3)

---
updated-dependencies:
- dependency-name: rack
  dependency-type: indirect
...

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Gemfile.lock

@@ -93,7 +93,7 @@ GEM
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     racc (1.6.2)
-    rack (2.2.6.2)
+    rack (2.2.6.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (6.0.0)