Bump assertj-core from 3.13.2 to 3.18.1

[dependabot-preview[bot]]

Bumps assertj-core from 3.13.2 to 3.18.1.

Commits

• 5cbaded [maven-release-plugin] prepare release assertj-core-3.18.1
• 4e04c29 Make isElementOfCustomAssert protected
• e78f410 Fix error mesage of ShouldNotHaveSameClass and test naming convention of same...
• 4dca4e7 Bump verify.bndrun junit version
• 4b500d2 Add map(…) and flatMap(…) to iterable assertions as aliases of extracting/fla...
• 41a6c42 Code cleanup and minor test refactoring
• c11e82f Bump verify.bndrun assertj-core version
• 1b823e3 Bump byte-buddy.version from 1.10.17 to 1.10.18 (#2031)
• 0f10304 Bump junit-jupiter.version from 5.6.2 to 5.6.3
• b4b8b58 Bump mockito.version from 3.5.15 to 3.6.0
• Additional commits viewable in compare view

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