Deprecate idp_cert_fingerprint in code #249

Job	Run time
rubocop	8s
Unit test (ubuntu-20.04, 3)	1m 43s
Unit test (ubuntu-20.04, 3.1)	1m 46s
Unit test (ubuntu-20.04, 3.2)	1m 48s
Unit test (ubuntu-20.04, 3.3)	1m 49s
Unit test (ubuntu-20.04, 3.4)	1m 45s
Unit test (ubuntu-20.04, jruby-9.4)	2m 41s
Unit test (ubuntu-20.04, truffleruby)	3m 35s
Unit test (macos-latest, 3)	1m 45s
Unit test (macos-latest, 3.1)	1m 41s
Unit test (macos-latest, 3.2)	1m 34s
Unit test (macos-latest, 3.3)	1m 59s
Unit test (macos-latest, 3.4)	1m 41s
Unit test (macos-latest, jruby-9.4)	2m 40s
Unit test (macos-latest, truffleruby)	3m 11s
Unit test (windows-latest, 3)	4m 41s
Unit test (windows-latest, 3.1)	4m 4s
Unit test (windows-latest, 3.2)	3m 52s
Unit test (windows-latest, 3.3)	3m 23s
Unit test (windows-latest, 3.4)	4m 20s
finish	4s
	50m 10s

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