Bump stellar-sdk from 10.4.1 to 11.2.0

Bumps [stellar-sdk](https://github.com/stellar/js-stellar-sdk) from 10.4.1 to 11.2.0.
- [Release notes](https://github.com/stellar/js-stellar-sdk/releases)
- [Changelog](https://github.com/stellar/js-stellar-sdk/blob/master/CHANGELOG.md)
- [Commits](stellar/js-stellar-sdk@v10.4.1...v11.2.0)

---
updated-dependencies:
- dependency-name: stellar-sdk
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>