V2.x - Nokogiri Upgrade Part 4 - Convert RubySaml::XML::Document to DocumentSigner #493

Job	Run time
rubocop	10s
Unit test (ubuntu-20.04, 3.1)	1m 48s
Unit test (ubuntu-20.04, 3)	1m 50s
Unit test (ubuntu-20.04, truffleruby)	3m 35s
Unit test (ubuntu-20.04, 3.3)	1m 49s
Unit test (ubuntu-20.04, jruby-9.4)	2m 29s
Unit test (ubuntu-20.04, 3.4)	1m 46s
Unit test (macos-latest, 3.3)	1m 33s
Unit test (macos-latest, truffleruby)	2m 38s
Unit test (macos-latest, 3.1)	1m 43s
Unit test (macos-latest, jruby-9.4)	2m 6s
Unit test (windows-latest, 3.3)	3m 31s
Unit test (windows-latest, 3.1)	4m 5s
Unit test (windows-latest, 3.2)	2m 57s
Unit test (macos-latest, 3.4)	1m 37s
Unit test (macos-latest, 3)	1m 38s
Unit test (windows-latest, 3.4)	4m 37s
Unit test (windows-latest, 3)	5m 17s
Unit test (ubuntu-20.04, 3.2)	1m 54s
Unit test (macos-latest, 3.2)	1m 33s
finish	0s
	48m 36s

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