Fix autoloading the VERSION constant

[skipkayhil]

While waiting for Statesman to support gap lock protection for Trilogy by default (#528) , I wanted to add a conditional monkeypatch to my Rails app based on the version of Statesman loaded. However, trying to reference Statesman::VERSION leads to an error:

$ irb
irb(main):001> require "statesman"
=> true
irb(main):002> Statesman::VERSION
(irb):2:in `<main>': uninitialized constant Statesman::VERSION (NameError)
Did you mean?  Statesman::Version
        from /home/hartley/.cache/asdf/installs/ruby/3.2.2/lib/ruby/gems/3.2.0/gems/irb-1.11.0/exe/irb:9:in `<top (required)>'
        from /home/hartley/.cache/asdf/installs/ruby/3.2.2/bin/irb:25:in `load'
        from /home/hartley/.cache/asdf/installs/ruby/3.2.2/bin/irb:25:in `<main>'

This commit fixes the issue by changing the autoload for the version.rb file to point to VERSION instead of Version (which does not exist).