Revert "Upgrade japgolly/setup-everything-scala"

This reverts commit 9c394b9.

Author: japgolly

.github/workflows/ci.yml

@@ -21,9 +21,9 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Setup Scala
-        uses: japgolly/setup-everything-scala@v3.0
+        uses: japgolly/setup-everything-scala@v2.0
         with:
-          java-version: adopt:1.${{ matrix.java }}
+          java-version: adopt@1.${{ matrix.java }}
 
       - name: Build and test
         shell: bash