Update Node package dependencies & GitHub Action versions

[svengreb]

Update all repository (development) Node packages and GitHub Actions to the latest versions and adapt to their changes:

• husky — Bump minimum version from ^6.0.0 to ^7.0.4 where 7.0.0 is a major update that allows to remove the .husky/.gitignore file to simplify the local installation and usage.
• lint-staged — Bump minimum version from ^11.0.0 to ^12.0.4 where 12.0.0 is a major update that allows ESM usage.
• prettier — Bump minimum version from ^2.3.2 to ^2.4.1.
• remark-cli — Bump minimum version from ^9.0.0 to ^10.0.0.