Update Attribute::TARGET for DefaultSchemeHost

[koriym]

For PHP8+

[codecov]

Codecov Report

Merging #168 (d3fcb2d) into 1.x (ab50bc4) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                 1.x      #168   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        52        52           
===========================================
  Files             18        18           
  Lines            129       129           
===========================================
  Hits             129       129           

Impacted Files	Coverage Δ
src/Annotation/DefaultSchemeHost.php	100.00% <ø> (ø)

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