Because truffleruby now uses prism itself for its ripper implementation, the templates need to be created beforehand.

So, move the ripper require inside the tasks itself, after which the templates have been created.

Example failure: https://github.com/ruby/prism/actions/runs/24358711087/job/71132405299

```
LoadError: cannot load such file -- /home/runner/work/prism/prism/lib/prism/node (LoadError)
/home/runner/work/prism/prism/lib/prism.rb:127:in '<top (required)>'
/home/runner/work/prism/prism/rakelib/lex.rake:4:in '<top (required)>'
/home/runner/work/prism/prism/vendor/bundle/truffleruby/34.0.0.1/gems/rake-13.3.1/exe/rake:27:in '<top (required)>'
/home/runner/.rubies/truffleruby-34.0.0/bin/bundle:25:in '<main>'
(See full trace by running task with --trace)
```

`lex.rake:4` is `require "ripper"`

Author: Earlopain

rakelib/lex.rake

@@ -1,8 +1,6 @@
 # frozen_string_literal: true
 # typed: ignore
 
-require "ripper"
-
 module Prism
   # This class is responsible for lexing files with both prism and
   # ripper and ensuring they match up. It keeps track of the files which
@@ -150,6 +148,7 @@ TARGETS.each do |name, target|
   task "lex:#{name}" => [dirpath, :compile] do
     $:.unshift(File.expand_path("../lib", __dir__))
     require "prism"
+    require "ripper"
 
     plain_text = ENV.fetch("CI", false)
     warn_failing = ENV.fetch("VERBOSE", false)
@@ -192,6 +191,7 @@ desc "Lex files and compare with lex_compat"
 task lex: :compile do
   $:.unshift(File.expand_path("../lib", __dir__))
   require "prism"
+  require "ripper"
 
   plain_text = ENV.fetch("CI", false)
   warn_failing = ENV.fetch("VERBOSE", false)
@@ -225,6 +225,7 @@ task "lex:rubygems": [:compile, "tmp/failing"] do
   require "rubygems/package"
   require "tmpdir"
   require "prism"
+  require "ripper"
 
   items = []
   Gem::SpecFetcher.new.available_specs(:latest).first.each do |source, gems|
@@ -366,6 +367,7 @@ task "lex:topgems": ["download:topgems", :compile] do
   require "rubygems/package"
   require "tmpdir"
   require "prism"
+  require "ripper"
 
   gem_names = YAML.safe_load_file(TOP_100_GEM_FILENAME)
   failing_files = {}