v2.x - Replace RubySaml::XML::Crypto namespace with RubySaml::XML #505

Job	Run time
rubocop	10s
Unit test (ubuntu-20.04, 3)	1m 45s
Unit test (ubuntu-20.04, 3.1)	1m 49s
Unit test (ubuntu-20.04, 3.2)	1m 46s
Unit test (ubuntu-20.04, 3.3)	1m 47s
Unit test (ubuntu-20.04, 3.4)	1m 48s
Unit test (ubuntu-20.04, jruby-9.4)	2m 36s
Unit test (ubuntu-20.04, truffleruby)	3m 47s
Unit test (macos-latest, 3)	1m 38s
Unit test (macos-latest, 3.1)	1m 36s
Unit test (macos-latest, 3.2)	1m 33s
Unit test (macos-latest, 3.3)	1m 33s
Unit test (macos-latest, 3.4)	1m 41s
Unit test (macos-latest, jruby-9.4)	1m 58s
Unit test (macos-latest, truffleruby)	2m 33s
Unit test (windows-latest, 3)	3m 23s
Unit test (windows-latest, 3.1)	3m 15s
Unit test (windows-latest, 3.2)	4m 5s
Unit test (windows-latest, 3.3)	4m 5s
Unit test (windows-latest, 3.4)	4m 55s
finish	4s
	47m 47s

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