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/.github/workflows/ci_test.yml b/.github/workflows/ci_test.yml
index 64aa65e..7ad48e3 100644
--- a/.github/workflows/ci_test.yml
+++ b/.github/workflows/ci_test.yml
@@ -8,10 +8,10 @@
     steps:
       - name: Checkout Koral
         uses: actions/checkout@v2
-      - name: Set up JDK 1.8
+      - name: Set up JDK 11
         uses: actions/setup-java@v1
         with:
-          java-version: 1.8
+          java-version: 11
 
       - name: Build and install Koral
         run: mvn --file pom.xml install
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>