Update Github Actions to JDK17

Use JDK17 in github actions.

Author: mdeinum

.github/workflows/spring-batch-excel.yml

@@ -12,10 +12,10 @@ jobs:
     steps:
       - name: Checkout source code
         uses: actions/checkout@v2
-      - name: Set up JDK 1.8
-        uses: actions/setup-java@v1
+      - name: Set up JDK 17
+        uses: actions/setup-java@v2
         with:
-          java-version: 1.8
+          java-version: 17
       - name: Build with Maven
         run: mvn -B package --file pom.xml
         working-directory: spring-batch-excel