Update pnpm/action-setup action to v6

Author: renovate[bot]

.github/workflows/async-api-validation.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v6
-    - uses: pnpm/action-setup@v5
+    - uses: pnpm/action-setup@v6
     - name: Install Node.js
       uses: actions/setup-node@v6
       with:

.github/workflows/bump.yml

@@ -27,7 +27,7 @@ jobs:
       - uses: actions/checkout@v6
         with:
           fetch-depth: 0 # for git describe --tags (used by bumpp internally)
-      - uses: pnpm/action-setup@v5
+      - uses: pnpm/action-setup@v6
       - uses: actions/setup-node@v6
         with:
           node-version: 24

.github/workflows/node.js.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v6
-    - uses: pnpm/action-setup@v5
+    - uses: pnpm/action-setup@v6
     - name: Install Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v6
       with:

.github/workflows/npm-publish.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: pnpm/action-setup@v5
+      - uses: pnpm/action-setup@v6
       - uses: actions/setup-node@v6
         with:
           node-version: 24