ci: update setup-uv to v10.0.1

[appleboy]

Summary

Upgrade astral-sh/setup-uv from v8.3.2 to v10.0.1 in the test and release workflows.

Related issues

• Jira: N/A
• GitHub/Gitea: N/A

AI authorship

• No AI was used
• AI was used
  • Tool / model: Codex / GPT-5
  • AI-authored files: .github/workflows/release.yml, .github/workflows/testing.yml
  • Human line-by-line reviewed: None — not yet reviewed by a human.

Change classification

• Leaf change
• Core change

Plan reference

Keep GitHub Actions dependencies current across the go-signet organization.

Verification

• Automated: go run github.com/rhysd/actionlint/cmd/actionlint@latest passed; git diff --check passed.
• Manual: Confirmed test and release workflows use astral-sh/setup-uv@v10.0.1.
• Not run: PyPI publishing, because it requires a release event and trusted publishing environment.

Security check

• No secrets in the diff
• External inputs are validated
• Permission checks are tested
• Errors do not leak internals
• N/A - no external or security-sensitive interface changed

Risk and rollback

• Risk: setup-uv v10 behavior or runner requirements could affect test and release jobs.
• Rollback: Revert this commit to restore v8.3.2.

Reviewer guide

• Read carefully: setup-uv major version change.
• Spot-check: Repeated update in both workflows.

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