Drop Edge <= 18 support

[swaterkamp]

d3-shape 2.0 and d3-color 2.0 are using ES6 and with the merge of those new dependency versions we will also drop support for the outdated Edge 18 and older versions.

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #2408 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2408      +/-   ##
==========================================
+ Coverage   54.89%   54.90%   +0.01%     
==========================================
  Files        1093     1093              
  Lines       26603    26603              
  Branches     7538     7538              
==========================================
+ Hits        14603    14606       +3     
+ Misses      10895    10892       -3     
  Partials     1105     1105              

Impacted Files	Coverage Δ
gsa/src/web/entities/container.js	45.71% <0.00%> (+1.22%)	⬆️

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