Danny:
As you mentioned, Oracle's java might be end of lifed on Sept 30, 2023 but there are a number of well supported openjdk java 11 variants that will be supported for much longer. For example, Amazon's Corretto Java 11, which we currently use, will receive security updates until Sept 2027.
https://endoflife.date/amazon-corretto
That said, Java 17 offers many performance and productivity improvements, making it an attractive goal for our software. We have done a lot of work preparing the codebase to be able to run on more modern java versions. While I cannot promise this, I would hope we can move to Java 17 within the next 12 months.