chore: update dependencies to latest compatible versions

- @actions/core 1.11.1 → 2.0.3 (v3 is ESM-only, incompatible with ncc)
- @actions/github 6.0.1 → 8.0.1 (v9 is ESM-only, incompatible with ncc)
- @octokit/rest 21.1.1 → 22.0.1
- node-fetch 2.7.0 → 3.3.2 (unused dep; kept for completeness)
- @types/node 20.19.25 → 25.4.0
- @vercel/ncc 0.36.1 → 0.38.4
- engines: node >=20.0.0 (reverted from 24.0.0 set by pnpm update)

Author: finalerock44