Update discipline-core to 1.4.0

[scala-steward]

Updates org.typelevel:discipline-core from 1.1.5 to 1.4.0.
GitHub Release Notes - Version Diff

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labels: library-update, commit-count:1, early-semver-minor, semver-spec-minor

[codecov-commenter]

Codecov Report

Merging #577 (a97aa06) into main (2a51408) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #577      +/-   ##
==========================================
- Coverage   90.23%   90.10%   -0.14%     
==========================================
  Files          15       15              
  Lines         758      758              
  Branches       40       43       +3     
==========================================
- Hits          684      683       -1     
- Misses         74       75       +1     

Impacted Files	Coverage Δ
core/src/main/scala/io/iteratee/Enumeratee.scala	99.57% <0.00%> (-0.43%)	⬇️

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[scala-steward]

Superseded by #605.