Bump java version from 8 to 11

Change-Id: I7bbc223561d3007d29b1269f2e545305f3d0be8b
Reviewed-on: https://korap.ids-mannheim.de/gerrit/c/KorAP/Koral/+/6274
Reviewed-by: Marc Kupietz <kupietz@ids-mannheim.de>
diff --git a/pom.xml b/pom.xml
index dceb9ca..227e310 100644
--- a/pom.xml
+++ b/pom.xml
@@ -39,8 +39,8 @@
 		<jackson.version>[2.14.0-rc1,)</jackson.version>
 		<antlr4.version>4.9.3</antlr4.version>
 		<antlr3.version>3.5.3</antlr3.version>
-		<java.version>1.8</java.version>
 		<log4j.version>[2.17.1,)</log4j.version>
+		<java.version>11</java.version>
 	</properties>
 	
 	<repositories>