Use pnpm version 9

Author: AndyBitz

.github/workflows/ci.yaml

@@ -11,10 +11,10 @@ jobs:
     steps:
       - name: Checkout the repository
         uses: actions/checkout@v2
-      - name: Setup PNPM 7
+      - name: Setup PNPM 9
         uses: pnpm/[email protected]
         with:
-          version: 7
+          version: 9
       - name: Setup Node 18
         uses: actions/setup-node@v2
         with: