Fix capybara version in base.gemfile.ruby27.lock

Capybara 3.40+ requires Ruby 3.0+, so use 3.39.2 for Ruby 2.7 tests.

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

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

Author: justin808

gemfiles/base.gemfile.ruby27.lock

@@ -88,7 +88,7 @@ GEM
       execjs (~> 2.0)
     builder (3.2.4)
     byebug (11.1.3)
-    capybara (3.40.0)
+    capybara (3.39.2)
       addressable
       matrix
       mini_mime (>= 0.1.3)