Fix multibuildpack test.

Author: robdimsdale

fixtures/multibuildpack/ruby_calls_go/Gemfile.lock

@@ -1,19 +1,19 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.6.4)
-    rack-protection (2.2.0)
-      rack
+    rack (2.2.8)
+    rack-protection (3.1.0)
+      rack (~> 2.2, >= 2.2.4)
     ruby2_keywords (0.0.5)
-    sinatra (2.2.0)
-      mustermann (~> 1.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.0)
+    sinatra (3.1.0)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.1.0)
       tilt (~> 2.0)
-    tilt (2.0.10)
-    webrick (1.7.0)
+    tilt (2.3.0)
+    webrick (1.8.1)
 
 PLATFORMS
   ruby
@@ -23,4 +23,7 @@ DEPENDENCIES
   webrick
 
 RUBY VERSION
-   ruby 3.1.3p185
+   ruby 3.4.2p28
+
+BUNDLED WITH
+   2.6.2