CI and automated releases

fix: Drop use of `java.util.Base64` to support Android API level < 27 #224

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Run time

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Job	Run time
ci / java11-ubuntu-latest	1m 55s
ci / java17-ubuntu-latest	2m 8s
ci / java11-macos-latest	4m 21s
ci / java17-macos-latest	2m 39s
ci / java11-windows-latest	3m 57s
ci / java17-windows-latest	3m 40s
release / release	1m 1s
	19m 41s