Remove invalid logger stub from mock options object

The HTTPX::Options class does not implement a method called 'logger'.
RSpec's instance_double correctly rejects stubs for non-existent methods.

This completes the minimal set of valid stubs needed for the test.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

react_on_rails_pro/spec/react_on_rails_pro/request_spec.rb

@@ -251,8 +251,7 @@
                 HTTPX::Options,
                 timeout: {},
                 debug_level: 0,
-                debug: false,
-                logger: nil
+                debug: false
               )
               mock_request = instance_double(
                 HTTPX::Request,