Bump rack from 2.2.6.2 to 3.0.8

Bumps [rack](https://github.com/rack/rack) from 2.2.6.2 to 3.0.8.
- [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...v3.0.8)

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

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

Gemfile.lock

@@ -75,14 +75,14 @@ GEM
     psych (5.0.1)
       stringio
     racc (1.7.3)
-    rack (2.2.6.2)
-    rack-session (1.0.2)
-      rack (< 3)
+    rack (3.0.8)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
     rack-test (2.0.2)
       rack (>= 1.3)
-    rackup (1.0.0)
-      rack (< 3)
-      webrick
+    rackup (2.1.0)
+      rack (>= 3)
+      webrick (~> 1.8)
     rails-dom-testing (2.2.0)
       activesupport (>= 5.0.0)
       minitest