Update default gems list at 6e78253 [ci skip]

Author: matzbot

NEWS.md

@@ -63,7 +63,7 @@ The following default gems are updated.
 * RubyGems 3.7.0.dev
 * bundler 2.7.0.dev
 * cgi 0.4.2
-* json 2.11.2
+* json 2.11.3
 * optparse 0.7.0.dev.2
 * prism 1.4.0
 * psych 5.2.3