Remove explicit pnpm version from workflows to fix version conflict

[Copilot]

The CI workflow failed because pnpm/action-setup@v4 detected conflicting versions: version: 10 in the workflow config vs "packageManager": "pnpm@10.28.0" in package.json.

Changes

• Removed version: 10 from pnpm/action-setup@v4 in both CI and release workflows
• The action now uses the version specified in package.json's packageManager field (10.28.0)

# Before
- name: Install pnpm
  uses: pnpm/action-setup@v4
  with:
    version: 10

# After
- name: Install pnpm
  uses: pnpm/action-setup@v4

Reference: https://github.com/objectstack-ai/spec/actions/runs/21110164385/job/60707559636#step:4:1

Original prompt

引用: https://github.com/objectstack-ai/spec/actions/runs/21110164385/job/60707559636#step:4:1

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