v3.8-p3.8.16

What's Changed

• Bump docker/metadata-action from 4.1.1 to 4.3.0 by @dependabot in https://github.com/Khalibre/privacyidea-docker/pull/56
• Bump docker/build-push-action from 3 to 4 by @dependabot in https://github.com/Khalibre/privacyidea-docker/pull/57
• update PI to 3.8 by @sida-khalibre in https://github.com/Khalibre/privacyidea-docker/pull/58

Full Changelog: Khalibre/privacyidea-docker@v3.7.4-p3.8.15...v3.8-p3.8.16