avoid deprecated java.net.URL constructor

[xuwei-k]

• https://bugs.openjdk.org/browse/JDK-8295949
• openjdk/jdk@4338f52

[codecov]

Codecov Report

Merging #1166 (c2e361f) into master (d83b4e4) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##           master    #1166   +/-   ##
=======================================
  Coverage   92.69%   92.69%           
=======================================
  Files          65       65           
  Lines         835      835           
  Branches       26       26           
=======================================
  Hits          774      774           
  Misses         61       61           

Impacted Files	Coverage Δ
...rc/main/scala/eu/timepit/refined/util/string.scala	0.00% <0.00%> (ø)
...rc/main/scala-3.0-/eu/timepit/refined/string.scala	98.76% <100.00%> (ø)

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[fthomas]

Thanks, @xuwei-k!