Replace RipperRubyParser with Prism for DescendantLoader

RipperRubyParser isn't really maintained anymore whereas Prism is
soon becoming the replacement official Ruby parser. Prism already has a
RubyParser translation layer internally, which is fully maintained.
Additionally, the performance of Prism is much faster than Ripper.

Performance testing DescendantLoader:

Cached sti_loader? | Measurement            | Time (s)
------------------ | ---------------------- | ---------------------
(Ripper) No cache  | Vm.descendants         | 15.303
(Prism)  No cache  | Vm.descendants         |  4.093 (73% faster)
(Ripper) No cache  | evm:compile_sti_loader | 20.120
(Prism)  No cache  | evm:compile_sti_loader |  8.216 (59% faster)
(Ripper) Cached    | Vm.descendants         |  0.554
(Prism)  Cached    | Vm.descendants         |  0.583 (same)
(Ripper) Cached    | evm:compile_sti_loader |  3.271
(Prism)  Cached    | evm:compile_sti_loader |  3.138 (same)

Gemfile

@@ -63,6 +63,7 @@ gem "openscap",                         "~>0.4.8",           :require => false
 gem "optimist",                         "~>3.0",             :require => false
 gem "pg",                               ">=1.4.1",           :require => false
 gem "pg-dsn_parser",                    "~>0.1.1",           :require => false
+gem "prism",                            ">=0.25.0",          :require => false # Used by DescendantLoader
 gem "psych",                            ">=3.1",             :require => false # 3.1 safe_load changed positional to kwargs like aliases: true: https://github.com/ruby/psych/commit/4d4439d6d0adfcbd211ea295779315f1baa7dadd
 gem "query_relation",                   "~>0.1.0",           :require => false
 gem "rack",                             ">=2.2.6.4",         :require => false
@@ -71,7 +72,6 @@ gem "rails",                            "~>6.1.7", ">=6.1.7.7"
 gem "rails-i18n",                       "~>6.x"
 gem "rake",                             ">=12.3.3",          :require => false
 gem "rest-client",                      "~>2.1.0",           :require => false
-gem "ripper_ruby_parser",               "~>1.11",            :require => false
 gem "ruby-progressbar",                 "~>1.7.0",           :require => false
 gem "rubyzip",                          "~>2.0.0",           :require => false
 gem "rugged",                           "~>1.5.0",           :require => false

lib/extensions/descendant_loader.rb

@@ -67,12 +67,11 @@ def self.status(io = $stdout)
   # be defined in [depending on runtime details], the name of the class,
   # and the name of its superclass), given a path to a ruby script file.
   module Parser
-    autoload :RipperRubyParser, 'ripper_ruby_parser'
+    autoload :Prism, 'prism'
 
     def classes_in(filename)
-      content = File.read(filename)
       begin
-        parsed = RipperRubyParser::Parser.new.parse(content, filename)
+        parsed = Prism::Translation::RubyParser.parse_file(filename)
       rescue => e
         warn "\nError parsing classes in #{filename}:\n#{e.class.name}: #{e}\n\n"
         raise