chore(deps): bump pnpm/action-setup from 3 to 4 (MisskeyIO#628)

* chore(deps): bump pnpm/action-setup from 3 to 4

Bumps [pnpm/action-setup](https://github.com/pnpm/action-setup) from 3 to 4.
- [Release notes](https://github.com/pnpm/action-setup/releases)
- [Commits](https://github.com/pnpm/action-setup/compare/v3...v4)

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

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: まっちゃとーにゅ <17376330+u1-liquid@users.noreply.github.com>

.github/workflows/validate-api-json.yml

@@ -23,11 +23,11 @@ jobs:
     steps:
     - uses: actions/checkout@v4.1.1
       with:
+        fetch-depth: 0
         submodules: true
     - name: Install pnpm
-      uses: pnpm/action-setup@v3
+      uses: pnpm/action-setup@v4
       with:
-        version: 9
         run_install: false
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v4.0.2