Update junit-platform-engine, ... to 6.1.1

[dwolla-oss-scala-steward]

About this PR

📦 Updates

• org.junit.platform:junit-platform-engine
• org.junit.platform:junit-platform-launcher

from 1.14.4 to 6.1.1 ⚠

Usage

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^{labels: test-library-update, early-semver-major, semver-spec-major, commit-count:1}

[bpholt]

This PR now removes the Java 11 build, so we'll need to remove that required check before it can be merged.