build(deps): bump soroban-sdk from 25.3.0 to 25.3.1

Bumps [soroban-sdk](https://github.com/stellar/rs-soroban-sdk) from 25.3.0 to 25.3.1.
- [Release notes](https://github.com/stellar/rs-soroban-sdk/releases)
- [Commits](stellar/rs-soroban-sdk@v25.3.0...v25.3.1)

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

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Author: dependabot[bot]