@Mathias Granger Thanks for posting, in Microsoft Q&A. All upcoming breaking changes are posted in Upcoming breaking changes as well as Product updates in advance and they are the best way to check the latest update and I would suggest you the same. Currently, there are no announcements made on retiring TLS 1.0 and TLS 1.1 in APIM.
However, we do recommend our customers to migrate to TLS 1.2 across all Azure services - Preparing for TLS 1.2 in Microsoft Azure
I hope this helps with your question but feel free to reach out for any other questions.