Outdated dependency: commons-collections4 (4.3 instead of 4.2)

[dzc34]

Observed behaviour

outdated dependency: commons-collections4

Expected behaviour

• upgrade commons-collections4 (4.3 instead of 4.2)
  • Java 8 or later is now required (maven with JDK 8)
  • https://commons.apache.org/proper/commons-collections/
  • Release Notes
    • https://commons.apache.org/proper/commons-collections/release_4_3.html
    • https://commons.apache.org/proper/commons-collections/changes-report.html#a4.3

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previous: #176