V2.x - Nokogiri Upgrade Part 4 - Convert RubySaml::XML::Document to DocumentSigner #501

Job	Run time
rubocop	11s
Unit test (ubuntu-20.04, 3)	1m 54s
Unit test (ubuntu-20.04, 3.1)	1m 45s
Unit test (ubuntu-20.04, 3.2)	1m 47s
Unit test (ubuntu-20.04, 3.3)	1m 47s
Unit test (ubuntu-20.04, 3.4)	1m 49s
Unit test (ubuntu-20.04, jruby-9.4)	2m 30s
Unit test (ubuntu-20.04, truffleruby)	3m 38s
Unit test (macos-latest, 3)	1m 37s
Unit test (macos-latest, 3.1)	1m 36s
Unit test (macos-latest, 3.2)	1m 39s
Unit test (macos-latest, 3.3)	1m 39s
Unit test (macos-latest, 3.4)	1m 41s
Unit test (macos-latest, jruby-9.4)	2m 13s
Unit test (macos-latest, truffleruby)	2m 36s
Unit test (windows-latest, 3)	4m 16s
Unit test (windows-latest, 3.1)	3m 10s
Unit test (windows-latest, 3.2)	3m 16s
Unit test (windows-latest, 3.3)	3m 10s
Unit test (windows-latest, 3.4)	3m 39s
finish	0s
	45m 53s

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