Update pnpm in size action

Author: timolins

.github/workflows/size.yml

@@ -7,9 +7,9 @@ jobs:
       CI_JOB_NUMBER: 1
     steps:
       - uses: actions/checkout@v2
-      - uses: pnpm/action-setup@v2.2.2
+      - uses: pnpm/action-setup@v4
         with:
-          version: 7
+          version: 9
       - uses: andresz1/size-limit-action@v1
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}