chore: continue testing on Node 15

[nickmccurdy]

It's still supported until June 1

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Codecov Report

Merging #663 (cb28a10) into master (03f38b9) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #663   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           50        50           
  Lines          932       932           
  Branches       367       363    -4     
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  Hits           932       932           

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[nickmccurdy]

I would merge, but I'm not sure how we'd want to update the branch protection rules

[ph-fritsche]

I think running it without requiring it is fine. But we could as well drop it or add the check requirement.
It's just about a month and this repo doesn't do anything that can be expected to work in one node version but not the other.
It's more or less just a smoke test for our config and dependencies and I don't expect any of them to support node16 and node14 but break in node15.

[nickmccurdy]

Personally I'd still rather have that smoke test even though it's unlikely to fail, because Node 15 is still supported for now.

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🎉 This PR is included in version 13.1.9 🎉

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