Dependency updates

[Ben-CA]

Seeing as saml2-js has 7 dependencies:

@xmldom/xmldom

async

debug

underscore

xml-crypto

xml-encryption

xmlbuilder2

Is this package going to be updated in the future with updated versions when these pose security risks or become deprecated?

[darioackermann]

Hey Ben, I am maintaining a fork with dependencies updated. Feel free to check it out, cheers.