chore(deps): bump pnpm/action-setup from 6.0.9 to 6.1.0

Bumps [pnpm/action-setup](https://github.com/pnpm/action-setup) from 6.0.9 to 6.1.0.
- [Release notes](https://github.com/pnpm/action-setup/releases)
- [Commits](pnpm/action-setup@v6.0.9...v6.1.0)

---
updated-dependencies:
- dependency-name: pnpm/action-setup
  dependency-version: 6.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/backend-tests.yml

@@ -30,7 +30,7 @@ jobs:
         name: Install Node.js
         with:
           node-version: 25
-      - uses: pnpm/action-setup@v6.0.9
+      - uses: pnpm/action-setup@v6.1.0
         name: Install pnpm
         with:
           package_json_file: ./etherpad-lite/package.json

.github/workflows/frontend-tests.yml

@@ -20,7 +20,7 @@ jobs:
         name: Install Node.js
         with:
           node-version: 25
-      - uses: pnpm/action-setup@v6.0.9
+      - uses: pnpm/action-setup@v6.1.0
         name: Install pnpm
         with:
           package_json_file: ./etherpad-lite/package.json

.github/workflows/npmpublish.yml

@@ -31,7 +31,7 @@ jobs:
         uses: actions/checkout@v7
         with:
           repository: ether/etherpad-lite
-      - uses: pnpm/action-setup@v6.0.9
+      - uses: pnpm/action-setup@v6.1.0
         name: Install pnpm
         with:
           run_install: false