4.2.0 - drop ansible 4,5 and add ansible 9, fix tox and gh-pages regression

(dropped just means no longer automatically tested, thus no major bump)

What's Changed

• refactor: drop support for ansible-core 2.11 and 2.12 by @JonasPammer in #157
• fix(ci): adapt to tox 4.12 regression by @JonasPammer in #158
• fix: make asciidoctor-reducer work for PRs again (regression of #150) by @JonasPammer in #159

Full Changelog: 4.1.0...4.2.0