CompatHelper: add new compat entry for "Clustering" at version "0.14"

[github-actions]

This pull request sets the compat entry for the Clustering package to 0.14.

This is a brand new compat entry. Previously, you did not have a compat entry for the Clustering package.

Note: I have not tested your package with this new compat entry. It is your responsibility to make sure that your package tests pass before you merge this pull request. Note: Consider tagging a patch release immediately after merging this PR, as downstream packages may depend on this for tests to pass.

[codecov]

Codecov Report

Merging #168 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #168   +/-   ##
=======================================
  Coverage   87.66%   87.66%           
=======================================
  Files          16       16           
  Lines        1305     1305           
=======================================
  Hits         1144     1144           
  Misses        161      161           

Impacted Files	Coverage Δ
src/Optimization.jl	89.92% <0.00%> (ø)

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