fix: properly mock time in ruby ci tests

Author: stainless-app[bot]

test/stagehand/client_test.rb

@@ -133,9 +133,11 @@ def test_client_retry_after_seconds
   end
 
   def test_client_retry_after_date
+    time_now = Time.now
+
     stub_request(:post, "http://localhost/v1/sessions/start").to_return_json(
       status: 500,
-      headers: {"retry-after" => (Time.now + 10).httpdate},
+      headers: {"retry-after" => (time_now + 10).httpdate},
       body: {}
     )
 
@@ -148,11 +150,11 @@ def test_client_retry_after_date
         max_retries: 1
       )
 
+    Thread.current.thread_variable_set(:time_now, time_now)
     assert_raises(Stagehand::Errors::InternalServerError) do
-      Thread.current.thread_variable_set(:time_now, Time.now)
       stagehand.sessions.start(model_name: "openai/gpt-4o")
-      Thread.current.thread_variable_set(:time_now, nil)
     end
+    Thread.current.thread_variable_set(:time_now, nil)
 
     assert_requested(:any, /./, times: 2)
     assert_in_delta(10, Thread.current.thread_variable_get(:mock_sleep).last, 1.0)