test: Fix tests on Java 21 or newer; replace InetAddress mocking code #152
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Some unit tests work with fake ("mocked") InetAddress objects, which are currently assembled via mockito. With Java 21 and newer, this is no longer possible.
Replace the mocking code with a new "InetAddressMockery" class that can provide real Inet4Address objects by means of Java object deserialization.
Fixes #144