chore: Update build system

[fsbraun]

This PR updates the build system

• Node.js 20
• Updated requirements
• Implicit canvas dependency is gone (fixing Documentation proposal for installation error of frontend packages #513?)

@erkesando Can you check if you can install from this fix (you can install the fix into your venv using pip install -e git+https://github.com/django-cms/djangocms-admin-style@chore/update-build-system)?

Pending: Update of webpack.config.js.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (89589a8) 100.00% compared to head (4aa3834) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #514   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           33        33           
  Branches         3         3           
=========================================
  Hits            33        33           

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[vinitkumar]

Looks good. Have you tried building the assets using this new build system?

[fsbraun]

Sure! Works nicely.

[vinitkumar]

Sure! Works nicely.

@fsbraun Shouldn't we also commit the built files in the same PR, so is there no diff for them?

[fsbraun]

@vinitkumar Fair point!! Just added them. The JS now uses ()=>{} notation. I.e., there is a change.