back to J8

Author: sllynn

.github/actions/scala_build/action.yml

@@ -10,7 +10,7 @@ runs:
         - name: Configure JDK
           uses: actions/setup-java@v2
           with:
-            java-version: '17'
+            java-version: '8'
             distribution: 'zulu'
         - name: Configure python interpreter
           shell: bash