chore(deps): update pnpm/action-setup action to v6

Author: renovate[bot]

.github/workflows/node.js-ci.yml

@@ -34,7 +34,7 @@ jobs:
         with:
           node-version: '24'
 
-      - uses: pnpm/action-setup@v5.0.0
+      - uses: pnpm/action-setup@v6.0.0
         with:
           run_install: false
 

.github/workflows/npm-publish.yml

@@ -29,7 +29,7 @@ jobs:
           node-version: 24
           registry-url: https://registry.npmjs.org
 
-      - uses: pnpm/action-setup@v5.0.0
+      - uses: pnpm/action-setup@v6.0.0
         name: Install pnpm
         with:
           run_install: false