fix: compatibility with webpack@5

[cap-Bernardito]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

avoid deprecation

Breaking Changes

Only for webpack@5

Additional Info

No

[codecov]

Codecov Report

Merging #16 into master will increase coverage by 0.83%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   94.16%   95.00%   +0.83%     
==========================================
  Files           5        5              
  Lines         257      240      -17     
  Branches       89       86       -3     
==========================================
- Hits          242      228      -14     
+ Misses         14       11       -3     
  Partials        1        1              

Impacted Files	Coverage Δ
src/Webpack4Cache.js	100.00% <100.00%> (ø)
src/Webpack5Cache.js	100.00% <100.00%> (+9.67%)	⬆️
src/index.js	93.68% <100.00%> (+0.06%)	⬆️

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