Update to setup-java@v2 (#384)

Author: wmdietl

.github/workflows/main.yml

@@ -39,9 +39,10 @@ jobs:
         with:
           python-version: '3.8'
       - name: Set up Java
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v2
         with:
           java-version: ${{ matrix.jdk }}
+          distribution: 'temurin'
       - name: Dump GitHub context
         env:
           GITHUB_CONTEXT: ${{ toJson(github) }}