Maintenance: Update dependency shoulda-matchers to v6.2.0

Gemfile.lock

@@ -597,7 +597,7 @@ GEM
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2, < 3.0)
       websocket (~> 1.0)
-    shoulda-matchers (6.1.0)
+    shoulda-matchers (6.2.0)
       activesupport (>= 5.2.0)
     simple_oauth (0.3.1)
     simple_po_parser (1.1.6)