Fix pnpm version conflict in GitHub Actions CI

- Removed 'version: latest' from pnpm/action-setup
- Let pnpm action use the version specified in package.json packageManager field
- This resolves the ERR_PNPM_BAD_PM_VERSION error in CI

Author: SFARPak

.github/workflows/ci.yml

@@ -65,8 +65,6 @@ jobs:
         run: npm run test
       - name: Setup pnpm
         uses: pnpm/action-setup@a7487c7e89a18df4991f7f222e4898a00d66ddda # v4.1.0
-        with:
-          version: latest
       - name: Clone nextjs-template
         run: git clone --depth 1 https://github.com/SFARPak/nextjs-template.git nextjs-template
       - name: Get pnpm store directory