Bump rack from 2.2.7 to 2.2.8

Bumps [rack](https://github.com/rack/rack) from 2.2.7 to 2.2.8.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rack/rack/compare/v2.2.7...v2.2.8)

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

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

Gemfile

@@ -10,7 +10,7 @@ gem 'puma', '~> 5.6'
 gem 'rails', '~> 6.1.7'
 gem 'sprockets', '~> 3.7.2'
 gem 'thor', '~> 1.2'
-gem 'rack', '~> 2.2.6'
+gem 'rack', '~> 2.2.8'
 
 gem 'hamlit-rails', '~> 0.2'
 gem 'pg', '~> 1.4'

Gemfile.lock

@@ -497,7 +497,7 @@ GEM
       activesupport (>= 3.0.0)
     raabro (1.4.0)
     racc (1.6.2)
-    rack (2.2.7)
+    rack (2.2.8)
     rack-attack (6.6.1)
       rack (>= 1.0, < 3)
     rack-cors (1.1.1)
@@ -842,7 +842,7 @@ DEPENDENCIES
   public_suffix (~> 5.0)
   puma (~> 5.6)
   pundit (~> 2.3)
-  rack (~> 2.2.6)
+  rack (~> 2.2.8)
   rack-attack (~> 6.6)
   rack-cors (~> 1.1)
   rack-test (~> 2.0)