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/publish.yml

@@ -13,7 +13,7 @@ jobs:
     timeout-minutes: 5
     steps:
     - uses: actions/checkout@v6
-    - uses: pnpm/action-setup@v5
+    - uses: pnpm/action-setup@v6
       with:
         version: latest
     - uses: actions/setup-node@v6

.github/workflows/spotters.yml

@@ -10,7 +10,7 @@ jobs:
     timeout-minutes: 5
     steps:
     - uses: actions/checkout@v6
-    - uses: pnpm/action-setup@v5
+    - uses: pnpm/action-setup@v6
       with:
         version: latest
     - uses: actions/setup-node@v6

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
         node: [22, 20]
     steps:
     - uses: actions/checkout@v6
-    - uses: pnpm/action-setup@v5
+    - uses: pnpm/action-setup@v6
       with:
         version: latest
     - uses: actions/setup-node@v6