downgrade antlr4 version to 4.9.3

4.9.3 is the last version being compatible with Java 8

pom.xml

@@ -3,7 +3,7 @@
 	<artifactId>a2lparser</artifactId>
 	<name>A2L Parser</name>
 	<groupId>net.alenzen.a2l</groupId>
-	<version>2.6.0</version>
+	<version>2.6.1</version>
 	<packaging>jar</packaging>
 	<description>ASAP2 parser</description>
 	<url>https://github.com/Luncher91/A2LParser/</url>
@@ -26,7 +26,8 @@
 	</distributionManagement>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<antlr4.version>4.13.0</antlr4.version>
+		<!-- Antlr4 4.9.3 is the last version compatible with Java 8 -->
+		<antlr4.version>4.9.3</antlr4.version>
 		<jackson.version>2.15.2</jackson.version>
 		<maven.compiler.source>1.8</maven.compiler.source>
 		<maven.compiler.target>1.8</maven.compiler.target>