Use mainline sbt launcher on CI

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
     - uses: coursier/setup-action@v1
       with:
         jvm: 8
-        apps: sbt-launcher
+        apps: sbt
     - run: scripts/ci.sh
       shell: bash
       env:
@@ -51,7 +51,7 @@ jobs:
       - uses: coursier/setup-action@v1
         with:
           jvm: 8
-          apps: sbt-launcher
+          apps: sbt
       - uses: olafurpg/setup-gpg@v3
       - name: Release
         run: sbt ci-release

scripts/ci.sh

@@ -2,11 +2,11 @@
 set -euvx
 
 if [ "$(expr substr $(uname -s) 1 5 2>/dev/null)" == "Linux" ]; then
-  SBT="sbt -C--plugin-version=2.0.0-RC6-8"
+  SBT="sbt"
 elif [ "$(uname)" == "Darwin" ]; then
-  SBT="sbt -C--plugin-version=2.0.0-RC6-8"
+  SBT="sbt"
 else
-  SBT="sbt.bat -C--plugin-version=2.0.0-RC6-8"
+  SBT="sbt.bat"
 fi
 
 lmCoursier() {