chore(ci): update `pnpm/action-setup` to v4 (#761)

.github/workflows/lint.yml

@@ -11,14 +11,12 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        node-version: [18]
+        node-version: [20]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Setup pnpm
-        uses: pnpm/action-setup@v2
-        with:
-          version: 8
+        uses: pnpm/action-setup@v4
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4
         with:

.github/workflows/sponsorkit.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: pnpm/action-setup@v3
+      - uses: pnpm/action-setup@v4
 
       - name: Set node
         uses: actions/setup-node@v4

.github/workflows/test.yml

@@ -11,14 +11,12 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        node-version: [18]
+        node-version: [20]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Setup pnpm
-        uses: pnpm/action-setup@v2
-        with:
-          version: 8
+        uses: pnpm/action-setup@v4
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4
         with: