Remove outdated sqlite3 upper bound from Gemfile

Rails main now requires sqlite3 2.0.0 or later.

Reference: https://github.com/rails/rails/blob/36b030d3e30c94f662800c9c69cd7cf504ed3639/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb#L14

gemfiles/Gemfile-rails-main

@@ -7,7 +7,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 gemspec path: ".."
 
 gem "puma"
-gem "sqlite3", "< 2"
+gem "sqlite3"
 gem "debug", ">= 1.7.0"
 gem "mocha"
 gem "rubocop-shopify", "~> 2.14", require: false