v4.0.5

Bugfixes:

• Handle when Rails is partially loaded as a Gem. (@bjacobs09, #727)
• Fix Rack compatibility with versions > 3 (@andrehjr, #729)

Misc:

• Add funding_uri to gemspec (@andrew, #726)
• Drop Rails 5.x Support (@andrehjr, #728)
• Drop Rails 6.0 and Ruby < 2.6 (@andrehjr, #729)
• Add support for Ruby 3.5+ (@andrehjr, #737)