Add java 17 to build

Author: Philippus

.github/workflows/scala.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         scala-version: [2.13.8]
-        java-version: [8, 11]
+        java-version: [8, 11, 17]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-java@v2