Delete obsolete Java keystore
Delete obsolete Java keystore

The code-signing certificate is expired. Also, SpotBugs is no
longer shipped by the University of Maryland.
spotbugs/spotbugs,KengoTODA/spotbugs,spotbugs/spotbugs,spotbugs/spotbugs,sewe/spotbugs,sewe/spotbugs,KengoTODA/spotbugs,johnscancella/spotbugs,johnscancella/spotbugs,spotbugs/spotbugs,KengoTODA/spotbugs,KengoTODA/spotbugs,sewe/spotbugs,sewe/spotbugs,johnscancella/spotbugs,johnscancella/spotbugs,spotbugs/spotbugs