chore(deps): update soroban-sdk requirement from 20.0.0 to 25.3.0 in /contracts

[dependabot]

Updates the requirements on soroban-sdk to permit the latest version.

Release notes

Sourced from soroban-sdk's releases.

21.7.7

What's Changed

• Limit the versions of arbitrary and derive_arbitrary to ~1.3.0 due to breaking changes in 1.4.x

Full Changelog: stellar/rs-soroban-sdk@v21.7.6...v21.7.7

Commits

• 5da789c Limit the versions of arbitrary/derive_arbitrary to 1.3.*
• f25bdaf Bump version to 21.7.7
• c6cca8f Update lock file
• ddada99 Prevent use with rust 1.82+ (#1371)
• 467fdf5 Bump version to 21.7.6
• e8732eb Add infallible From conversions for types to ScVal (#1338)
• 68411e7 Add test demonstrating issue with using Option inside an enum
• 9604623 Bump version to 21.7.5
• f67b4bf Fix importing contract crates into other crates for testing (#1364)
• 3834537 Bump version to 21.7.4
• Additional commits viewable in compare view

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