Downgrade to Logback 1.3 for Java 8 compatibility

build.gradle

@@ -35,7 +35,7 @@ configurations.all {
 }
 
 dependencies {
-	implementation(group: "ch.qos.logback", name: "logback-classic", version: "1.4.5")
+	implementation(group: "ch.qos.logback", name: "logback-classic", version: "1.3.5")
 	implementation(group: "com.google.guava", name: "guava", version: "31.0.1-jre")
 	implementation(group: "de.hhu.stups", name: "de.prob2.kernel", version: "4.0.0-SNAPSHOT")
 	implementation(group: "io.github.spencerpark", name: "jupyter-jvm-basekernel", version: "2.3.0")