Update dependency com.google.android.horologist:horologist-compose-tools to v0.6.21

Author: renovate[bot]

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ coreKtx = "1.13.1"
 coreSplashscreen = "1.0.1"
 espressoCore = "3.6.1"
 google-ksp = "2.0.21-1.0.25"
-horologistComposeTools = "0.6.9"
+horologistComposeTools = "0.6.21"
 horologistTiles = "0.6.11"
 junit = "4.13.2"
 junitVersion = "1.2.1"