pin cgi to 0.3.7 (#17487)

(cherry picked from commit eeb2162)

Author: kaisecheng

Gemfile.template

@@ -46,3 +46,4 @@ gem "date", "= 3.3.3"
 gem "thwait"
 gem "bigdecimal", "~> 3.1"
 gem "psych", "5.2.2"
+gem "cgi", "0.3.7" # Pins until a new jruby version with updated cgi is released