Fix broken workflows.

Author: uhafner

.github/workflows/ci.yml

@@ -15,9 +15,9 @@ jobs:
         platform: [ubuntu-latest, macos-latest, windows-latest]
         jdk: [17]
         include:
-          - os: ubuntu-latest
+          - platform: ubuntu-latest
             jdk: 11
-          - os: macos-latest
+          - platform: macos-latest
             jdk: 11
 
     runs-on: ${{ matrix.platform }}