Updated java version for CI test.

Change-Id: I70ffd91f038106a0f856f9c3332de67d922ad08a
diff --git a/.github/workflows/ci_test.yml b/.github/workflows/ci_test.yml
index 398af8f..2d31a4a 100644
--- a/.github/workflows/ci_test.yml
+++ b/.github/workflows/ci_test.yml
@@ -29,10 +29,10 @@
           repository: KorAP/Koral
           path: Koral
 
-      - name: Set up JDK 11
+      - name: Set up JDK 17
         uses: actions/setup-java@v1
         with:
-          java-version: 11
+          java-version: 17
 
       - name: Build and install Krill
         run: mvn --file Krill/pom.xml install