Keep using URI::RFC2396_PARSER parser

The default parser in URI 1.0.0 / Ruby 3.4 has been changed to RFC3986
[[1]]. This causes test failures such as:

~~~
... snip ...

Failure:
GlobalIDTest#test_invalid_app_name [test/cases/global_id_test.rb:13]:
ArgumentError expected but nothing was raised.

rails test test/cases/global_id_test.rb:8

F

... snip ...
~~~

where underscores / ampersands are now allowed in host. Keep using
`URI::RFC2396_PARSER` for compatibility.

Fixes #190

[1]: ruby/uri#107

lib/global_id/uri/gid.rb

@@ -62,7 +62,7 @@ def validate_app(app)
       #   URI.parse('gid://bcx')       # => URI::GID instance
       #   URI::GID.parse('gid://bcx/') # => raises URI::InvalidComponentError
       def parse(uri)
-        generic_components = URI.split(uri) << nil << true # nil parser, true arg_check
+        generic_components = URI.split(uri) << URI::RFC2396_PARSER << true # nil parser, true arg_check
         new(*generic_components)
       end