Bump rack from 2.2.6.4 to 3.0.9.1

Bumps [rack](https://github.com/rack/rack) from 2.2.6.4 to 3.0.9.1.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v2.2.6.4...v3.0.9.1)

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

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

Gemfile.lock

@@ -3,6 +3,7 @@ GEM
   specs:
     addressable (2.8.1)
       public_suffix (>= 2.0.2, < 6.0)
+    base64 (0.2.0)
     colorator (1.1.0)
     concurrent-ruby (1.1.10)
     em-websocket (0.5.3)
@@ -67,9 +68,12 @@ GEM
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (5.0.0)
-    rack (2.2.6.4)
-    rack-protection (3.0.4)
-      rack
+    rack (3.0.9.1)
+    rack-protection (4.0.0)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -82,16 +86,17 @@ GEM
     sawyer (0.8.2)
       addressable (>= 2.3.5)
       faraday (> 0.8, < 2.0)
-    sinatra (3.0.4)
+    sinatra (4.0.0)
       mustermann (~> 3.0)
-      rack (~> 2.2, >= 2.2.4)
-      rack-protection (= 3.0.4)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.0.0)
+      rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
-    sinatra-contrib (3.0.4)
-      multi_json
+    sinatra-contrib (4.0.0)
+      multi_json (>= 0.0.2)
       mustermann (~> 3.0)
-      rack-protection (= 3.0.4)
-      sinatra (= 3.0.4)
+      rack-protection (= 4.0.0)
+      sinatra (= 4.0.0)
       tilt (~> 2.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)