Update GitHub Actions: Fix the broken release build

Author: kevin-lee

.github/workflows/release.yml

@@ -53,7 +53,7 @@ jobs:
           echo "SBT_OPTS=${SBT_OPTS}"
           java -version
           sbt \
-            ++${{ matrix.scala.version }}! \
+            ++${{ matrix.scala.version }} \
             -v \
             clean \
             test