Remove net.Error.Temporary

[FileGo]

This fixes #533 to remove functionality, deprecated in Go 1.18.

[codecov]

Codecov Report

Merging #536 (14c68cc) into development (8d0bd8e) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           development     #536   +/-   ##
============================================
  Coverage        93.73%   93.73%           
============================================
  Files               36       36           
  Lines             3112     3112           
============================================
  Hits              2917     2917           
  Misses             145      145           
  Partials            50       50           

Impacted Files	Coverage Δ
lists/downloader.go	100.00% <100.00%> (ø)
resolver/upstream_resolver.go	91.03% <100.00%> (ø)

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[0xERR0R]

Thanks!