ci: fix bump version failed

[majin1102]

Publish beta failed because:

We should add this pinned version

[github-actions]

PR Review

Summary: This PR adds the missing lance-namespace-datafusion workspace dependency to fix the bumpversion/publish workflow failure.

Assessment: ✅ LGTM

The change is correct and minimal:

• The lance-namespace-datafusion crate was already a workspace member (line 16 of Cargo.toml)
• It was missing from [workspace.dependencies], which broke version bumping
• The new entry is correctly placed in alphabetical order between lance-namespace-impls and lance-namespace-reqwest-client
• The version matches the workspace version (2.1.0-beta.0)

No concerns with this fix.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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