build(deps): bump pnpm/action-setup from 5 to 6

Bumps [pnpm/action-setup](https://github.com/pnpm/action-setup) from 5 to 6.
- [Release notes](https://github.com/pnpm/action-setup/releases)
- [Commits](pnpm/action-setup@v5...v6)

---
updated-dependencies:
- dependency-name: pnpm/action-setup
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/pr-check.yaml

@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v6
-      - uses: pnpm/action-setup@v5
+      - uses: pnpm/action-setup@v6
         name: Install pnpm
         with:
           run_install: false
@@ -66,7 +66,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: pnpm/action-setup@v5
+      - uses: pnpm/action-setup@v6
         name: Install pnpm
         with:
           run_install: false