Bump rack from 2.2.3 to 2.2.3.1

Bumps [rack](https://github.com/rack/rack) from 2.2.3 to 2.2.3.1.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@2.2.3...2.2.3.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -206,7 +206,9 @@ GEM
     mime-types (3.2.2)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2018.0812)
-    mimemagic (0.3.2)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
     minitest (5.14.0)
@@ -241,7 +243,7 @@ GEM
     psych (3.0.3)
     public_suffix (3.0.3)
     puma (3.12.6)
-    rack (2.2.3)
+    rack (2.2.3.1)
     rack-cors (1.0.5)
       rack (>= 1.6.0)
     rack-test (1.1.0)