Fix: Shut down ice4j harvester thread pool properly. (Bump ice4j).

[JonathanLennox]

No description provided.

[JonathanLennox]

Other ice4j changes don't need noting here; just test and Maven deployment changes.

[codecov]

Codecov Report

Merging #1629 (ec20da7) into master (9b642e4) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1629   +/-   ##
=========================================
  Coverage     34.83%   34.83%           
  Complexity      843      843           
=========================================
  Files           141      141           
  Lines          8322     8322           
  Branches       1143     1143           
=========================================
  Hits           2899     2899           
  Misses         5129     5129           
  Partials        294      294           

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