chore: remove nightly packages from testing scope

[erisu]

Motivation, Context & Description

• Remove the nightly packages from testing that was used temporarily
• Use actual released packages

Testing

• npm t

Checklist

• [x] I've run the tests to see all new and existing tests pass

[codecov-commenter]

Codecov Report

Merging #839 into master will decrease coverage by 0.41%. The diff coverage is 91.30%.

@@            Coverage Diff             @@
##           master     #839      +/-   ##
==========================================
- Coverage   89.96%   89.55%   -0.42%     
==========================================
  Files          46       46              
  Lines        2133     2097      -36     
==========================================
- Hits         1919     1878      -41     
- Misses        214      219       +5     

Impacted Files	Coverage Δ
src/util/promise-util.js	100.00% <ø> (+16.66%)	:arrow_up:
src/cordova/restore-util.js	92.50% <91.30%> (-1.46%)	:arrow_down:
src/plugman/util/dependencies.js	92.10% <0.00%> (-2.64%)	:arrow_down:
src/plugman/install.js	90.87% <0.00%> (-1.59%)	:arrow_down:
src/cordova/platform/addHelper.js	94.73% <0.00%> (-1.32%)	:arrow_down:

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