Update Chart.js to 3.7.1
Redmine is now using 2.8.0 which was released almost 3 years ago (14 Mar 2019). There are use cases in which plugin developers would want to use Chart.js but to use latest features they have to ship another js bundle.
I looked into code, there are only few usages, so it should not be hard to upgrade.
Also it would be nice to upgrade jQuery to latest (3.6.0 atm).
I wonder why jQuery is shipped in single bundle with jQueryUI and Rails UJS making them harder to upgrade.