deps: update kotest to v6.0.6

Author: renovate[bot]

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ bouncyCastle = "1.83"
 clikt = "5.0.3"
 itextpdf = "5.5.13.4"
 koinCore = "4.1.1"
-kotest = "6.0.5"
+kotest = "6.0.6"
 kotlinxSerialization = "1.9.0"
 ks3 = "1.0.0"
 pdfbox = "3.0.6"