chore(deps): bump soroban-sdk from 21.7.7 to 27.0.2 in /contracts

Bumps [soroban-sdk](https://github.com/stellar/rs-soroban-sdk) from 21.7.7 to 27.0.2.
- [Release notes](https://github.com/stellar/rs-soroban-sdk/releases)
- [Commits](stellar/rs-soroban-sdk@v21.7.7...v27.0.2)

---
updated-dependencies:
- dependency-name: soroban-sdk
  dependency-version: 27.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]