[java] LooseCoupling - fix false positive with generics

[adangel]

Rule: LooseCoupling

I found this while trying to run PMD 7 on PMD 7 sources (dogfood).

It addresses the following false positive:

• [INFO] PMD Failure: net.sourceforge.pmd.properties.GenericMultiValuePropertyDescriptor:26 Rule:LooseCoupling Priority:1 Avoid using implementation types like 'C'; use the interface instead.
  with generics...
  

  pmd/pmd-core/src/main/java/net/sourceforge/pmd/properties/GenericMultiValuePropertyDescriptor.java

  Line 26 in f36b99f

  private final Set<PropertyConstraint<? super C>> listValidators;

[pmd-test]

	2 Messages
📖	Compared to pmd/7.0.x: This changeset changes 0 violations, introduces 0 new violations, 0 new errors and 0 new configuration errors, removes 25 violations, 0 errors and 0 configuration errors. Full report
📖	Compared to master: This changeset changes 48809 violations, introduces 25830 new violations, 5 new errors and 0 new configuration errors, removes 179102 violations, 27 errors and 3 configuration errors. Full report
✅	Compared to pmd/7.0.x: This changeset changes 0 violations, introduces 4 new violations, 0 new errors and 0 new configuration errors, removes 310 violations, 0 errors and 0 configuration errors. Full report
✅	Compared to master: This changeset changes 45901 violations, introduces 25391 new violations, 38 new errors and 0 new configuration errors, removes 182110 violations, 27 errors and 3 configuration errors. Full report
✅	Compared to pmd/7.0.x: This changeset changes 0 violations, introduces 0 new violations, 0 new errors and 0 new configuration errors, removes 24 violations, 0 errors and 0 configuration errors. Full report
✅	Compared to master: This changeset changes 45900 violations, introduces 25638 new violations, 38 new errors and 0 new configuration errors, removes 182075 violations, 27 errors and 3 configuration errors. Full report

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