[mcp23017] Update Pi4J to 1.4 so binding works with Java 11 #10293
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Fixes #9503. The Pi4j version 1.4 introduces Java 11 compatibility
by implementing a missing function as native code and thus dropping
the dependency to the function jdk.internal.misc.SharedSecrets.
See Pi4J/pi4j-v1#442 for details.
Signed-off-by: Michael Rumpf michael@rumpfonline.de