chore: remove deprecated epsilon reference

[DanielBauman88]

See https://doc.rust-lang.org/std/f64/constant.EPSILON.html Updated to https://doc.rust-lang.org/std/primitive.f64.html#associatedconstant.EPSILON

[codecov[bot]]

Codecov Report

Merging #396 (d81997a) into master (002edce) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #396   +/-   ##
=======================================
  Coverage   79.52%   79.52%           
=======================================
  Files          52       52           
  Lines        4455     4455           
=======================================
  Hits         3543     3543           
  Misses        912      912           

Impacted Files	Coverage Δ
jsonschema/src/keywords/multiple_of.rs	81.03% <100.00%> (ø)
jsonschema/src/error.rs	57.71% <0.00%> (ø)

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[Stranger6667]

Thanks!