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

Author: renovate[bot]

.github/workflows/sharevb-github-pages-publish.yml

@@ -39,7 +39,7 @@ jobs:
         with:
           node-version: 22
 
-      - uses: pnpm/action-setup@v2
+      - uses: pnpm/action-setup@8912a9102ac27614460f54aedde9e1e7f9aec20d # v6
         name: Install pnpm
         id: pnpm-install
         with: