Skip SSL error stub test on JRuby

JRuby's socket classes don't support Minitest's stub method
aliasing, which causes NameError when trying to stub :gets
on socket objects.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: petergoldstein

test/integration/test_network.rb

@@ -204,6 +204,9 @@
       end
 
       it 'handles SSL error during read operations' do
+        # JRuby's socket classes don't support Minitest's stub method aliasing
+        skip 'Minitest stub incompatible with JRuby sockets' if RUBY_ENGINE == 'jruby'
+
         with_nil_logger do
           memcached(p, 19_191) do |dc|
             # First set a value so we have something to get