I have a use-case for being able to cache the intermediate fetch of
metadata in case of temporary failures, so rather than:

    parser.parse_remote(url)

I'd like to

    begin
      metadata = parser.get_idp_metadata(url, true)
      do_my_caching(metadata)
      parser.parse(metadata)
    rescue HttpError
      load_cache
    end

There's a fair amount of logic in the get_idp_metadata method that I'd
rather not need to re-implement. Right now I have this implemented with
`parser.send(:get_idp_metadata, url, true)` which is obviously not great
if the internals of this class change in the future. Can we move this
method to the public API?

…tadata-public

Make IdpMetadataParser#get_idp_metadata public

…sts-windows

Master: Fix tests on Windows, add Ruby 3.3, and cleanup CI

* Use correct XPaths and resolve to correct elements

* Update xml_security.rb

* Block references that resolve to multiple nodes to prevent signature wrapping attacks

This test warns

    warning: ambiguity between regexp and two divisions: wrap regexp in parentheses or add a space after `/' operator

We can fix this warning by using the %r regex syntax instead

…#718)

…e-master-20240711

…master-20240711