update chart.js to 3.9.1

[jxjj]

This updates chart.js to the latest release.

building can fail with the previous version of Chart.js:

ERROR in ./node_modules/chart.js/helpers/helpers.mjs 1:0-36
Module not found: Error: Can't resolve '../dist/helpers.esm' in '/home/runner/work/ChimeIn2.0/ChimeIn2.0/node_modules/chart.js/helpers'
Did you mean 'helpers.esm.js'?
BREAKING CHANGE: The request '../dist/helpers.esm' failed to resolve only because it was resolved as fully specified
(probably because the origin is strict EcmaScript Module, e. g. a module with javascript mimetype, a '*.mjs' file, or a '*.js' file where the package.json contains '"type": "module"').
The extension in the request is mandatory for it to be fully specified.
Add the extension to the request.

See: chartjs/Chart.js#10552

[cmcfadden]

why did this just start breaking though?