ci: fix typo in workflow (#13)

Author: matrei

.github/workflows/build.yml

@@ -35,7 +35,7 @@ jobs:
       - name: "☕️ Setup JDK"
         uses: actions/setup-java@v4
         with:
-          java-version: 8,
+          java-version: 8
           distribution: liberica
       - name: "🐘 Setup Gradle"
         uses: gradle/actions/setup-gradle@v4