Update plugins

[holgerfriedrich]

Update all plugins listed by mvn versions:display-plugin-updates -nsu -B -Dversions.outputLineWidth=120 | grep -- '->' | sort -u

• set minimum Maven version to 3.6.3
• build-helper-maven-plugin, 3.4.0 to 3.5.0, see https://github.com/mojohaus/build-helper-maven-plugin/releases/tag/3.5.0
• license-maven-plugin, 4.2 to 4.3
• maven-assembly-plugin, 3.6.0 to 3.7.1, see https://github.com/apache/maven-assembly-plugin/releases
• maven-compiler-plugin, 3.11.0 to 3.13.0
• maven-enforcer-plugin, 3.4.0 to 3.4.1
• sortpom-maven-plugin, 3.3.0 to 3.4.1, see https://github.com/Ekryd/sortpom/releases
• spotless-maven-plugin, 2.38.0 to 2.43.0, see https://github.com/diffplug/spotless/blob/main/plugin-maven/CHANGES.md

[holgerfriedrich]

FYI: Similar PRs have been merged in our other repos: openhab/openhab-core#4197, openhab/openhab-addons#16683, openhab/openhab-webui#2551.