Upgrades setup-purescript

Author: finnhodgkin

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - uses: purescript-contrib/setup-purescript@v2.0.0
+      - uses: purescript-contrib/setup-purescript@main
         with:
           purescript: 0.15.15
           psa: 0.8.2