fix(s3-static-assets): always use posix path join for fast-glob in re…

[dphang]

…adDirectoryFiles

• On windows, path.join returns paths separated by backslashes, but fast-glob only accepts posix paths.

In the future, we should run at least the unit tests on Windows workflow to ensure it doesn't break.

Should fix: #932

[codecov]

Codecov Report

Merging #940 (f47e287) into master (81d9d18) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #940   +/-   ##
=======================================
  Coverage   81.39%   81.39%           
=======================================
  Files          69       69           
  Lines        2516     2516           
  Branches      599      599           
=======================================
  Hits         2048     2048           
  Misses        401      401           
  Partials       67       67           

Impacted Files	Coverage Δ
...ibs/s3-static-assets/src/lib/readDirectoryFiles.ts	100.00% <100.00%> (ø)

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