Merged Pull Requests since 0.12.16

• Disabled some CI tests by @lefou in https://github.com/com-lihaoyi/mill/pull/5921
• Rebootstrap on Mill 0.12.16 by @lefou in https://github.com/com-lihaoyi/mill/pull/5918
• Add more forward-compatible API and deprecations by @lefou in https://github.com/com-lihaoyi/mill/pull/5914
• Update zinc to 1.11.0 by @lefou in https://github.com/com-lihaoyi/mill/pull/5934
• Deprecate more API that got removed in Mill 1.0 by @lefou in https://github.com/com-lihaoyi/mill/pull/6393
• Prepare release 0.12.17 by @lefou in https://github.com/com-lihaoyi/mill/pull/6397

Full Changelog: https://github.com/com-lihaoyi/mill/compare/0.12.16...0.12.17