Fix test for exceptions

In ruby 3.3 it is just `undefined method 'name' for nil`
In the others, it is nil:NilClass

spec/integration/sinatra_spec.rb

@@ -122,7 +122,7 @@ class MySinatraApp < Sinatra::Base
       it 'logs the request with the exception' do
         get '/error', {}, 'HTTP_X_REQUEST_ID' => '700a6a01'
 
-        expect(last_log_entry).to start_with("E, #{time_pid_tags} GET /error 500 in 0ms type=request #{data_as_text} exception=undefined method `name' for nil:NilClass\n")
+        expect(last_log_entry).to start_with("E, #{time_pid_tags} GET /error 500 in 0ms type=request #{data_as_text} exception=undefined method `name' for nil")
       end
     end
   end

spec/support/request_spec.rb

@@ -115,7 +115,7 @@
         '_request.request_id' => '471a34dc',
         '_request.duration' => 0,
         '_exception.klass' => 'NoMethodError',
-        '_exception.message' => start_with("undefined method `name' for nil:NilClass"),
+        '_exception.message' => start_with("undefined method `name' for nil"),
         '_exception.backtrace' => be_a(String),
         '_tags' => '471a34dc TEST_TAG',
       )