build(github): fix pnpm version in workflow

Author: mlaursen

.github/workflows/main.yml

@@ -45,7 +45,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: pnpm/action-setup@v2.2.4
         with:
-          version: 7
+          version: 8
       - uses: actions/setup-node@v3
         with:
           node-version: 18
@@ -76,7 +76,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: pnpm/action-setup@v2.2.4
         with:
-          version: 7
+          version: 8
       - uses: actions/setup-node@v3
         with:
           node-version: 18
@@ -131,7 +131,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: pnpm/action-setup@v2.2.4
         with:
-          version: 7
+          version: 8
       - uses: actions/setup-node@v3
         with:
           node-version: 18