Try to fix test freeze by updating logback version to 1.2.9.

Author: AlexeyKuznetsov-DD

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ spock = "2.3-groovy-3.0"
 spock24 = "2.4-M6-groovy-3.0"
 groovy = "3.0.24"
 junit5 = "5.9.2"
-logback = "1.3.15"
+logback = "1.2.9"
 bytebuddy = "1.17.5"
 scala = "2.11.12" # Last version to support Java 7 (2.12+ require Java 8+)
 scala211 = "2.11.12"