chore(deps): update pnpm/action-setup action to v6 (#5521)

Co-authored-by: homarr-renovate[bot] <158783068+homarr-renovate[bot]@users.noreply.github.com>

.github/workflows/deployment-docker-image.yml

@@ -60,7 +60,7 @@ jobs:
         if: env.SKIP_RELEASE == 'false'
         with:
           persist-credentials: false
-      - uses: pnpm/action-setup@v5
+      - uses: pnpm/action-setup@v6
         if: env.SKIP_RELEASE == 'false'
       - uses: actions/setup-node@v6
         if: env.SKIP_RELEASE == 'false'