For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.
A GitHub update doesn't "update" anything (if you had already Fabrik3.7 installed).
Did you clear Joomla and browser cache so it's running the new JS file?
BTW: Does a "on change" makes sense for checkboxes? Typically you want to check multiple ones and the filter shouldn't run for every single click.