Use YAML syntax for list

Author: keeganwitt

.github/workflows/ci.yaml

@@ -17,7 +17,14 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        version: [8-jdk-jammy, 11-jdk-jammy, 11-jdk-alpine, 17-jdk-jammy, 17-jdk-alpine, 21-jdk-jammy, 21-jdk-alpine]
+        version:
+          - 8-jdk-jammy
+          - 11-jdk-jammy
+          - 11-jdk-alpine
+          - 17-jdk-jammy
+          - 17-jdk-alpine
+          - 21-jdk-jammy
+          - 21-jdk-alpine
     steps:
       - name: checkout
         uses: actions/checkout@v2