Update pnpm to version 8 (#38)

Author: Demivan

.github/workflows/test.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Setup pnpm
         uses: pnpm/action-setup@v2.2.4
         with:
-          version: 7.x.x
+          version: 8.x.x
 
       - name: Install
         run: pnpm i