ci(ci.yml): 更新 pnpm/action-setup 至 v6

Author: liweijie0812

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v6
 
       - uses: actions/setup-node@v6
         with:
@@ -25,7 +25,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v6
 
       - uses: actions/setup-node@v6
         with: