Bump rack from 3.1.8 to 3.2.4

Bumps [rack](https://github.com/rack/rack) from 3.1.8 to 3.2.4.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v3.1.8...v3.2.4)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 3.2.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile

@@ -7,7 +7,7 @@ gemspec
 
 gem 'minitest', '~> 5.0'
 gem 'mocha', '~> 2.0'
-gem 'rack', '~> 3.1'
+gem 'rack', '~> 3.2'
 gem 'rackup', '~> 2.0'
 gem 'rake', '~> 13.3'
 gem 'redcarpet', '~> 3.0'

Gemfile.lock

@@ -23,7 +23,7 @@ GEM
       ruby2_keywords (>= 0.0.5)
     net-http (0.6.0)
       uri
-    rack (3.1.18)
+    rack (3.2.4)
     rackup (2.2.1)
       rack (>= 3)
     rake (13.3.1)
@@ -42,7 +42,7 @@ DEPENDENCIES
   lean-microsoft-graph!
   minitest (~> 5.0)
   mocha (~> 2.0)
-  rack (~> 3.1)
+  rack (~> 3.2)
   rackup (~> 2.0)
   rake (~> 13.3)
   redcarpet (~> 3.0)