Bump rack from 2.2.2 to 2.2.4 (#4)

Bumps [rack](https://github.com/rack/rack) from 2.2.2 to 2.2.4.

Changelog
## [2.2.4] - 2022-06-30

- Better support for lower case headers in `Rack::ETag` middleware. ([#1919](rack/rack#1919), [@ioquatix](https://github.com/ioquatix))
- Use custom exception on params too deep error. ([#1838](rack/rack#1838), [@simi](https://github.com/simi))

## [2.2.3.1] - 2022-05-27

- [CVE-2022-30123] Fix shell escaping issue in Common Logger
- [CVE-2022-30122] Restrict parsing of broken MIME attachments

## [2.2.3] - 2020-06-15

### Security

- [[CVE-2020-8184](https://nvd.nist.gov/vuln/detail/CVE-2020-8184)] Do not allow percent-encoded cookie name to override existing cookie names. BREAKING CHANGE: Accessing cookie names that require URL encoding with decoded name no longer works. ([@fletchto99](https://github.com/fletchto99))

Gemfile.lock

@@ -9,7 +9,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     builder (3.2.4)
-    rack (2.2.2)
+    rack (2.2.4)
     rake (13.0.1)
     request_store (1.5.0)
       rack (>= 1.4)