Bump webmock from 3.26.1 to 3.26.2

Fixes test failures with http 6.x. webmock 3.26.2 adds support for
the keyword argument change to HTTP::Response.new in http 6.0.0.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: horgh

Gemfile.lock

@@ -96,7 +96,7 @@ GEM
     unicode-display_width (3.2.0)
       unicode-emoji (~> 4.1)
     unicode-emoji (4.2.0)
-    webmock (3.26.1)
+    webmock (3.26.2)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)