CompatHelper: bump compat for Clustering to 0.15 for package test, (keep existing compat) (#1972)

Co-authored-by: CompatHelper Julia <[email protected]>

Author: github-actions[bot]

test/Project.toml

@@ -36,7 +36,7 @@ AbstractMCMC = "4"
 AdvancedMH = "0.6, 0.7"
 AdvancedPS = "0.4"
 AdvancedVI = "0.1"
-Clustering = "0.14"
+Clustering = "0.14, 0.15"
 Distributions = "0.25"
 DistributionsAD = "0.6.3"
 DynamicHMC = "2.1.6, 3.0"