Revert "Update dependency better_errors to v2.10.0 (#2537)" (#2544)

This reverts commit c4c9b3d.

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- [ ] **LABELS** Add a label: `enhancement`, `bug`, `improvement`, `new
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playbook-website/Gemfile

@@ -40,7 +40,7 @@ group :development do
   gem "listen", ">= 3.0.5", "< 3.7.2"
   gem "web-console", ">= 3.3.0"
   # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
-  gem "better_errors", "2.10.0"
+  gem "better_errors", "2.9.1"
   gem "binding_of_caller"
   gem "rubocop", "1.36.0"
   gem "rubocop-performance", "~> 1.15.0"

playbook-website/Gemfile.lock

@@ -82,10 +82,10 @@ GEM
     babel-transpiler (0.7.0)
       babel-source (>= 4.0, < 6)
       execjs (~> 2.0)
-    better_errors (2.10.0)
+    better_errors (2.9.1)
+      coderay (>= 1.0.0)
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
-      rouge (>= 1.0.0)
     bindex (0.8.1)
     binding_of_caller (1.0.0)
       debug_inspector (>= 0.0.1)
@@ -105,6 +105,7 @@ GEM
     chromedriver-helper (2.1.1)
       archive-zip (~> 0.10)
       nokogiri (~> 1.8)
+    coderay (1.1.3)
     concurrent-ruby (1.2.2)
     connection_pool (2.4.0)
     crass (1.0.6)
@@ -164,7 +165,7 @@ GEM
     puma (5.6.5)
       nio4r (~> 2.0)
     racc (1.6.2)
-    rack (2.2.7)
+    rack (2.2.6.4)
     rack-proxy (0.7.2)
       rack
     rack-test (2.1.0)
@@ -282,7 +283,7 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
-  better_errors (= 2.10.0)
+  better_errors (= 2.9.1)
   binding_of_caller
   bootsnap (>= 1.1.0)
   byebug