Test FileAlg.removeTemporarily with a nonexistent file

[fthomas]

No description provided.

[codecov]

Codecov Report

Merging #594 into master will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #594      +/-   ##
==========================================
+ Coverage      59%   59.12%   +0.11%     
==========================================
  Files          67       67              
  Lines         866      866              
  Branches       42       42              
==========================================
+ Hits          511      512       +1     
+ Misses        355      354       -1

Impacted Files	Coverage Δ
.../main/scala/org/scalasteward/core/io/FileAlg.scala	88.46% <0%> (+3.84%)	⬆️

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