Update to webpack@5 and webpack-cli@4.

[davidlehn]

Note this a breaking change for 2.x or later.

• [ ] Remove deprecated worker-loader, enable and fix Worker tests.

[codecov-commenter]

Codecov Report

Merging #945 (0510c98) into main (7928551) will decrease coverage by 0.72%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #945      +/-   ##
==========================================
- Coverage   79.84%   79.11%   -0.73%     
==========================================
  Files          42       42              
  Lines        9510     9510              
==========================================
- Hits         7593     7524      -69     
- Misses       1917     1986      +69     

Impacted Files	Coverage Δ
lib/prime.js	12.26% <0.00%> (-37.74%)	:arrow_down:
lib/rsa.js	72.72% <0.00%> (-5.86%)	:arrow_down:

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