Remove GitHub CI cache plugin which is no longer supported.

Author: yruslan

.github/workflows/build.yml

@@ -17,7 +17,6 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
-      - uses: coursier/cache-action@v5
       - name: Setup JDK and sbt
         uses: actions/setup-java@v4
         with: