Upgrade spago to 1.0

Author: yzyzsun

.github/workflows/purs.yml

@@ -14,10 +14,12 @@ jobs:
       - uses: actions/checkout@v4
 
       - uses: purescript-contrib/setup-purescript@main
+        with:
+          spago: unstable
 
       - uses: actions/cache@v4
         with:
-          key: ${{ runner.os }}-spago-${{ hashFiles('**/*.dhall') }}
+          key: ${{ runner.os }}-spago-${{ hashFiles('**/spago.yaml') }}
           path: |
             .spago
             output