[Gems] Pin Rack to ~> 2.0

Unicorn is lacking support and mishandles cookies (and probably a bunch of other stuff as well)

Gemfile

@@ -31,6 +31,9 @@ gem 'newrelic_rpm'
 gem "diffy"
 gem "rugged"
 
+# Blocked by unicorn which lacks a release with Rack 3 support
+gem "rack", "~> 2.0"
+
 gem 'opensearch-ruby'
 
 gem 'mailgun-ruby'

Gemfile.lock

@@ -224,16 +224,16 @@ GEM
     puma (6.4.2)
       nio4r (~> 2.0)
     racc (1.7.3)
-    rack (3.0.8)
+    rack (2.2.8)
     rack-proxy (0.7.7)
       rack
-    rack-session (2.0.0)
-      rack (>= 3.0.0)
+    rack-session (1.0.2)
+      rack (< 3)
     rack-test (2.1.0)
       rack (>= 1.3)
-    rackup (2.1.0)
-      rack (>= 3)
-      webrick (~> 1.8)
+    rackup (1.0.0)
+      rack (< 3)
+      webrick
     rails (7.1.3)
       actioncable (= 7.1.3)
       actionmailbox (= 7.1.3)
@@ -399,6 +399,7 @@ DEPENDENCIES
   opensearch-ruby
   pg
   puma
+  rack (~> 2.0)
   rails (~> 7.1.0)
   recaptcha
   redis