Upgrade protocol-rack gem, remove workaround

Previously, having this gem at the latest version was causing problems when booting the app: https://github.com/socketry/protocol-rack/issues/20

This is no longer the case. Goodbye, workaround!

Gemfile

@@ -6,9 +6,6 @@ gem 'rails', '~> 8.0', '>= 8.0.1'
 # The HTTP server running the Rails instance.
 gem 'falcon', '~> 0.48.0'
 
-# HACK: Workaround for https://github.com/socketry/protocol-rack/issues/20
-gem 'protocol-rack', '~> 0.10.0', '< 0.11.0'
-
 # Our database is MySQL, in both development and production.
 gem 'mysql2', '~> 0.5.5'
 

Gemfile.lock

@@ -304,8 +304,9 @@ GEM
     protocol-http2 (0.22.1)
       protocol-hpack (~> 1.4)
       protocol-http (~> 0.47)
-    protocol-rack (0.10.1)
-      protocol-http (~> 0.37)
+    protocol-rack (0.15.0)
+      io-stream (>= 0.10)
+      protocol-http (~> 0.43)
       rack (>= 1.0)
     psych (5.2.6)
       date
@@ -552,7 +553,6 @@ DEPENDENCIES
   omniauth (~> 2.1)
   omniauth-rails_csrf_protection (~> 1.0)
   omniauth_openid_connect (~> 0.7.1)
-  protocol-rack (~> 0.10.0, < 0.11.0)
   rack-attack (~> 6.7)
   rack-mini-profiler (~> 3.1)
   rails (~> 8.0, >= 8.0.1)