refactor: use fs.promises in generate license file, rollup config, Part 5

[dnalborczyk]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

Description

[codecov]

Codecov Report

Merging #4389 (bcef8d2) into master (33a4278) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4389   +/-   ##
=======================================
  Coverage   98.72%   98.72%           
=======================================
  Files         204      204           
  Lines        7315     7320    +5     
  Branches     2082     2080    -2     
=======================================
+ Hits         7222     7227    +5     
  Misses         34       34           
  Partials       59       59           

Impacted Files	Coverage Δ
cli/run/batchWarnings.ts	99.20% <100.00%> (+<0.01%)	⬆️
src/Chunk.ts	100.00% <100.00%> (ø)
src/Module.ts	100.00% <100.00%> (ø)
src/ModuleLoader.ts	100.00% <100.00%> (ø)
src/utils/resolveId.ts	93.33% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 89ee52c...bcef8d2. Read the comment docs.