build(deps-dev): bump assertj-core from 2.6.0 to 3.15.0

[dependabot-preview[bot]]

Bumps assertj-core from 2.6.0 to 3.15.0.

Commits

• 018b3a0 [maven-release-plugin] prepare release assertj-core-3.15.0
• 9fadafe set version to 3.15.0-SNAPSHOT
• 5afe94e Add ignoreFieldsOfTypes to RecursiveComparisonConfiguration
• bff1a7f Reduce areEqual() usage in favor of java.util.Objects.equals() (#1764)
• a52f7d0 Try map input as last attempt in PropertyOrFieldSupport (#1763)
• deab4c1 Fix midnight issue on LocalTime assumption tests
• e163c2f Fix one more javadoc mistake
• dee56ef Remove the 'TestFailures' helper class (#1758)
• 42fd091 Fix a couple javadoc mistakes
• 06d7cb9 Bump bnd.version from 4.3.1 to 5.0.0 (#1761)
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

A newer version of org.assertj:assertj-core exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.