chore(ci): do not hard code node versions

[SimenB]

Purpose (TL;DR) - mandatory

I assume the purpose is to always run on an LTS version of node here. So specifying lts/* does the same thing, but does not have to be updated when v18 (and v20 etc) becomes LTS

[codecov[bot]]

Codecov Report

Merging #417 (978f890) into master (16592d6) will increase coverage by 1.29%. The diff coverage is n/a.

:exclamation: Current head 978f890 differs from pull request most recent head 5430157. Consider uploading reports for the commit 5430157 to get more accurate results

@@            Coverage Diff             @@
##           master     #417      +/-   ##
==========================================
+ Coverage   94.17%   95.46%   +1.29%     
==========================================
  Files           1        1              
  Lines         618      618              
==========================================
+ Hits          582      590       +8     
+ Misses         36       28       -8     

Flag	Coverage Δ
unit	95.46% <ø> (+1.29%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/fake-timers-src.js	95.46% <0.00%> (+1.29%)	:arrow_up:

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[fatso83]

Great small fix!