Drop Node.js 14 support

[SergeAstapov]

Follow up to #913

[hjdivad]

Can you look into the failing tests

As in #913 the floating deps test is expected to fail, but the rest should be green.

[hjdivad]

@SergeAstapov

[SergeAstapov]

@hjdivad it seems never version of npm bundled with Node.js 16 cause a hard error because ember-try-test-suite-helper@0.0.1 specific here actually does not exist on npm (only 1.0.0 and 1.0.1 have been published)

it seems more correctly to actually publish that version to npm, wonder if @kategengler can do so.

meanwhile I'll try to look if there is something else missing or I can came up with a workaround

[mansona]

Hey folks 👋 #893 has CI passing and works around that problem you also identified @SergeAstapov

[codecov]

Codecov Report

Merging #920 (496d0cf) into master (c92dc69) will increase coverage by 0.04%.
The diff coverage is 100.00%.

❗ Current head 496d0cf differs from pull request most recent head 54f68f5. Consider uploading reports for the commit 54f68f5 to get more accurate results

@@            Coverage Diff             @@
##           master     #920      +/-   ##
==========================================
+ Coverage   94.54%   94.59%   +0.04%     
==========================================
  Files          17       17              
  Lines         550      555       +5     
==========================================
+ Hits          520      525       +5     
  Misses         30       30              

Files Changed	Coverage Δ
smoke-test-app/tests/dummy/config/ember-try.js	100.00% <ø> (ø)
lib/dependency-manager-adapters/npm.js	98.41% <100.00%> (+0.06%)	⬆️

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[kategengler]

Changes requested from @mansona

[kategengler]

Thank you!!