Replace use of Stream.eval(...).flatten with Stream.force

[cb372]

What this does?

Just a small refactoring. I didn't know about the force function until now.

Checklist

• Reviewed the diff to look for typos, println and format errors.
• Updated the docs accordingly.

[codecov]

Codecov Report

Merging #913 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #913   +/-   ##
=======================================
  Coverage   88.58%   88.58%           
=======================================
  Files          58       58           
  Lines         832      832           
  Branches        3        3           
=======================================
  Hits          737      737           
  Misses         95       95           

Impacted Files	Coverage Δ
...kindness/mu/rpc/internal/server/fs2/handlers.scala	88.88% <ø> (ø)

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[fedefernandez]

cool