Try to fix release CI

Author: kiendang

.github/workflows/ci.yml

@@ -33,11 +33,11 @@ jobs:
       - name: Test virtualenv
         run: scripts/virtualenv_test.sh 0.5.2
   publish:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     needs: [test]
     if: github.event_name != 'pull_request' && (github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/v'))
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v2.3.4
         with:
           fetch-depth: 0
       - uses: olafurpg/setup-scala@v13

project/metals.sbt

@@ -3,3 +3,4 @@
 // This file enables sbt-bloop to create bloop config files.
 
 addSbtPlugin("ch.epfl.scala" % "sbt-bloop" % "1.5.0")
+