Bump @wormhole-foundation/sdk-stacks from 4.13.1 to 4.20.0

Bumps [@wormhole-foundation/sdk-stacks](https://github.com/wormhole-foundation/wormhole-sdk-ts) from 4.13.1 to 4.20.0.
- [Release notes](https://github.com/wormhole-foundation/wormhole-sdk-ts/releases)
- [Commits](wormhole-foundation/wormhole-sdk-ts@4.13.1...4.20.0)

---
updated-dependencies:
- dependency-name: "@wormhole-foundation/sdk-stacks"
  dependency-version: 4.20.0
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]