Enhancement: Use PHP_FLOAT_EPSILON

[localheinz]

This pull request

• uses PHP_FLOAT_EPSILON in the FloatProvider

Follows sebastianbergmann/phpunit#4874.

h/t @marijnvanwezel

[codecov]

Codecov Report

Merging #23 (128106b) into main (053949b) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main      #23   +/-   ##
=========================================
  Coverage     96.77%   96.77%           
  Complexity       45       45           
=========================================
  Files             9        9           
  Lines           186      186           
=========================================
  Hits            180      180           
  Misses            6        6           

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

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