entry: fix direct require by requiring constants

[OddBloke]

Without this, we see the following failure:

$ ruby -e'require "zip/entry"'
/usr/lib/ruby/gems/3.2.0/gems/rubyzip-3.0.0/lib/zip/entry.rb:13:in `<class:Entry>': uninitialized constant Zip::COMPRESSION_METHOD_STORE (NameError)

    STORED   = ::Zip::COMPRESSION_METHOD_STORE
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^
	from /usr/lib/ruby/gems/3.2.0/gems/rubyzip-3.0.0/lib/zip/entry.rb:9:in `<module:Zip>'
	from /usr/lib/ruby/gems/3.2.0/gems/rubyzip-3.0.0/lib/zip/entry.rb:7:in `<top (required)>'
	from <internal:/usr/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:160:in `require'
	from <internal:/usr/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:160:in `rescue in require'
	from <internal:/usr/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:40:in `require'
	from -e:1:in `<main>'
<internal:/usr/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:86:in `require': cannot load such file -- zip/entry (LoadError)
	from <internal:/usr/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:86:in `require'
	from -e:1:in `<main>'

[hainesr]

Thanks. It was on my TODO list to make sure all these dependencies were accounted for but I clearly didn't get to it before 3.0.0.

[coveralls]

coverage: 96.908% (+0.001%) from 96.907%
when pulling d8118d5 on OddBloke:oddbloke/entry
into f1d0f48 on rubyzip:master.