chore(deps): bump soroban-sdk in the cargo group across 1 directory

Bumps the cargo group with 1 update in the / directory: [soroban-sdk](https://github.com/stellar/rs-soroban-sdk).


Updates `soroban-sdk` from 25.3.0 to 26.1.0
- [Release notes](https://github.com/stellar/rs-soroban-sdk/releases)
- [Commits](stellar/rs-soroban-sdk@v25.3.0...v26.1.0)

---
updated-dependencies:
- dependency-name: soroban-sdk
  dependency-version: 25.3.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: cargo
...

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Author: dependabot[bot]