#40265 chore(deps): bump @actions/github to v9 to remove undici 5.29.0

Summary

Bumps packages/release-action GitHub Action deps to their latest majors so undici@5.29.0 falls out of the dependency tree.

Before

@actions/github@6.0.1
  └─ undici@5.29.0 (via ^5.28.5)

@actions/core@1.11.1
  └─ @actions/http-client@2.2.3
      └─ undici@5.29.0 (via ^5.25.4)

After

@actions/github@9.1.1
  └─ undici@6.25.0 (via ^6.23.0)

@actions/core@3.0.1
  └─ @actions/http-client@3.0.2 (no undici)

Bumps

• @actions/core 1.11.1 → 3.0.1
• @actions/exec 1.1.1 → 3.0.0
• @actions/github 6.0.1 → 9.1.1
• @octokit/core 5.0.2 → 7.0.6
• @octokit/plugin-throttling 6.1.0 → 11.0.3

All majors, but scope is limited to packages/release-action (release automation only — not runtime / app code).

Test plan

• Package builds clean (tsc runs with no errors)
• CI passes
• Release action still works when invoked by maintainers (validate on next release cut)

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated GitHub Actions and Octokit library dependencies to newer major versions for enhanced stability.

Task: ARCH-2112