False positive diff for array with maxItems

[rq-trichins]

In #780, the fix for matching maxItems and minItems was changed to check if "oldValue == newValue". But those are both "Integer" and so the equality is doing an object matching, not an equality of the actual integers. It should be "oldValue.equals(newValue)" or "Objects.equals(oldValue, newValue)".

I'm seeing this when the maxItems is a large number. Sometimes, the JVM reuses the same object for the integer and sometimes it doesn't. When it doesn't reuse the same object, then the existing comparison fails.

[DrSatyr]

@rq-trichins, good catch, thank you. Fixed.

[rq-trichins]

@DrSatyr , is it possible to backport this into a 2.1.2 release?

[DrSatyr]

@rq-trichins done, please check 2.1.2