Apply template update: [ruby] Update all Bundler dependencies (2026-04-04)

Source: mockdeep/Rails-Template#1392

Author: Template Bot

Gemfile.lock

@@ -232,7 +232,7 @@ GEM
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     ostruct (0.6.3)
-    parallel (1.27.0)
+    parallel (1.28.0)
     parser (3.3.11.1)
       ast (~> 2.4.1)
       racc