update test fixtures off of ruby 2.0

Author: Sophie Wigmore

integration/testdata/bundler_version_1_17/Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-ruby '~> 2.0'
+ruby '~> 3.1'
 
 gem 'sinatra', '~>2.1.0'
 

integration/testdata/bundler_version_1_17/Gemfile.lock

@@ -42,7 +42,7 @@ DEPENDENCIES
   sinatra (~> 2.1.0)
 
 RUBY VERSION
-   ruby 2.5.1p57
+   ruby 3.1.4p223
 
 BUNDLED WITH
-  1.17.3
+   1.17.3

integration/testdata/offline_app/Gemfile

@@ -1,5 +1,6 @@
 source 'https://rubygems.org'
 
-ruby '~> 2.0'
+ruby '~> 3.0'
 
 gem 'sinatra'
+gem 'puma'

integration/testdata/offline_app/Gemfile.lock

@@ -3,6 +3,9 @@ GEM
   specs:
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
+    nio4r (2.5.9)
+    puma (6.2.1)
+      nio4r (~> 2.0)
     rack (2.2.3)
     rack-protection (2.1.0)
       rack
@@ -18,8 +21,11 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  puma
   sinatra
 
 RUBY VERSION
-   ruby 2.5.1p57
+   ruby 3.1.4p223
 
+BUNDLED WITH
+   2.2.33

integration/testdata/offline_app/vendor/cache/nio4r-2.5.9.gem

@@ -1,5 +1,6 @@
 source 'https://rubygems.org'
 
-ruby '~> 2.0'
+ruby '~> 3.0'
 
 gem 'sinatra'
+gem 'puma'

integration/testdata/offline_app/vendor/cache/puma-6.2.1.gem

@@ -3,6 +3,9 @@ GEM
   specs:
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
+    nio4r (2.5.9)
+    puma (6.2.1)
+      nio4r (~> 2.0)
     rack (2.2.3)
     rack-protection (2.1.0)
       rack
@@ -18,8 +21,11 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  puma
   sinatra
 
 RUBY VERSION
-   ruby 2.5.1p57
+   ruby 3.1.4p223
 
+BUNDLED WITH
+   2.3.26