chore: update soroban-sdk from 22.0.8 to 22.0.10

[KevinMB0220]

Summary

Closes #470 — Dividend Distribution and Claiming Module

This PR delivers the complete dividend distribution and claiming module for the AssetUp tokenization contract, implementing all functions specified in the issue along with a full test suite and a dependency fix that unblocked the test runner.

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Changes

contracts/assetsup/src/dividends.rs

Full implementation of the dividend module:

• distribute_dividends(env, asset_id, total_amount)
  Validates total_amount > 0, checks revenue_sharing_enabled, iterates all token holders, computes each share as (holder_balance / total_supply) * total_amount, accumulates into unclaimed_dividends, and emits a ("dividend", "distributed") event.

• claim_dividends(env, asset_id, holder)
  Requires holder authentication (holder.require_auth() enforced in lib.rs), returns and zeroes the holder’s unclaimed balance, and emits a ("dividend", "claimed") event.

• get_unclaimed_dividends(env, asset_id, holder)
  Read-only query returning the current unclaimed balance (returns 0 for unknown holders).

• enable_revenue_sharing(env, asset_id) / disable_revenue_sharing(env, asset_id)
  Toggles the revenue_sharing_enabled flag on the TokenizedAsset.

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contracts/assetsup/src/tests/dividends_new.rs

Five tests covering all acceptance criteria:

Test	Verifies
test_distribute_dividends_no_revenue_sharing	Distribution fails when revenue sharing is disabled
test_distribute_dividends	50/50 split is accurate across two holders
test_proportional_dividend_distribution	40/30/30 split across three holders
test_claim_dividends	Claiming returns correct amount and zeroes the balance
test_claim_dividends_insufficient	Claiming with 0 unclaimed returns an error

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contracts/Cargo.lock

Updated soroban-sdk from 22.0.8 → 22.0.10.
The previous version had internal compilation errors in testutils that prevented the entire test suite from running.

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Acceptance Criteria

• Dividend amounts accurately proportional to ownership
• Claiming zeroes the holder's unclaimed balance
• Distribution fails if revenue sharing is disabled

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Test Results

running 39 tests
... 39 passed; 0 failed

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Notes

• Integer division truncation is consistent with Soroban’s i128 arithmetic — any dust from rounding stays undistributed (not lost, just not allocated).
• distribute_dividends does not require auth at the contract level, allowing any caller (e.g., a backend service) to trigger distributions. If stricter access control is desired, tokenizer.require_auth() can be added.

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