Pin sqlite to avoid build issue (#2078)

Related: rails/rails#35153 and rails/rails#35154

Author: benoittgt

example_app_generator/generate_app.rb

@@ -23,6 +23,7 @@
   gsub_file "Gemfile", /.*debugger.*/, ''
   gsub_file "Gemfile", /.*byebug.*/, "gem 'byebug', '~> 9.0.6'"
   gsub_file "Gemfile", /.*puma.*/, ""
+  gsub_file "Gemfile", /.*sqlite3.*/, "gem 'sqlite3', '~> 1.3.6'"
   if RUBY_VERSION < '2.2.2'
     gsub_file "Gemfile", /.*rdoc.*/, "gem 'rdoc', '< 6'"
   end