Upgrade to laravel-mix v6 (webpack v5) and other js dependencies
- It makes the compilation 2 times faster for me
- Most importantly, this is a bugfix for the vue-i18n related issue.
Test Plan: ./phpuint --testsuite=Browser
Reviewers: #hkccp_developers, mollekopf
Reviewed By: #hkccp_developers, mollekopf
Subscribers: mollekopf, #hkccp_developers
Differential Revision: https://git.kolab.org/D2401