refactor: Replace fse.readdir with fs.promises.readdir

[sdas13]

Addresses: #8605

[codecov]

Codecov Report

Merging #9780 (9164e7f) into master (32de9bf) will decrease coverage by 0.05%.
The diff coverage is 16.66%.

❗ Current head 9164e7f differs from pull request most recent head 8cf57f8. Consider uploading reports for the commit 8cf57f8 to get more accurate results

@@            Coverage Diff             @@
##           master    #9780      +/-   ##
==========================================
- Coverage   86.18%   86.12%   -0.06%     
==========================================
  Files         330      330              
  Lines       12806    12809       +3     
==========================================
- Hits        11037    11032       -5     
- Misses       1769     1777       +8     

Impacted Files	Coverage Δ
lib/Serverless.js	68.75% <0.00%> (-3.10%)	⬇️
scripts/pkg/upload/world.js	0.00% <0.00%> (ø)
lib/utils/telemetry/index.js	78.94% <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 32de9bf...8cf57f8. Read the comment docs.

[pgrzesik]

Thank you @sdas13, it looks great 👏