chore(deps): update pnpm/action-setup action to v6 (#570)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ecosystem.yml

@@ -29,7 +29,7 @@ jobs:
         with:
           node-version: lts/*
 
-      - uses: pnpm/action-setup@v5
+      - uses: pnpm/action-setup@v6
         with:
           package_json_file: og-image/package.json