Update sbt-partial-unification with support for 2.13.0-M4

[kailuowang]

No description provided.

[codecov-io]

Codecov Report

Merging #2302 into master will increase coverage by 0.3%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #2302     +/-   ##
=========================================
+ Coverage   94.76%   95.06%   +0.3%     
=========================================
  Files         338      338             
  Lines        5840     5875     +35     
  Branches      222      220      -2     
=========================================
+ Hits         5534     5585     +51     
+ Misses        306      290     -16

Impacted Files	Coverage Δ
core/src/main/scala/cats/data/OptionT.scala	97.11% <0%> (-0.36%)	⬇️
laws/src/main/scala/cats/laws/MonadLaws.scala	100% <0%> (ø)	⬆️
core/src/main/scala/cats/data/Ior.scala	98.48% <0%> (+0.01%)	⬆️
core/src/main/scala/cats/Eval.scala	98.75% <0%> (+0.04%)	⬆️
core/src/main/scala/cats/data/IorT.scala	97.76% <0%> (+0.05%)	⬆️
core/src/main/scala/cats/syntax/either.scala	99.16% <0%> (+14.16%)	⬆️

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