deps: bump openzeppelin-contracts 4.8.3 -> 5.6.1

[thedavidmeister]

Cascade-bump for the rain.math.float soldeer migration. The OZ Math.Rounding enum reorders between 4.x and 5.x, but our code constructs values via integer cast so the shift is a no-op for the unsigned cases this lib uses. forge t est passes 78/78.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Upgraded OpenZeppelin contracts dependency from version 4.8.3 to 5.6.1, including updates to fixed-point decimal arithmetic and string formatting utilities with corresponding test updates.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 7da29137-a63c-4386-a617-6ea885eb755c

📥 Commits

Reviewing files that changed from the base of the PR and between 90ded4a and 198f760.

⛔ Files ignored due to path filters (1)

• soldeer.lock is excluded by !**/*.lock

📒 Files selected for processing (6)

• foundry.toml
• remappings.txt
• src/lib/LibFixedPointDecimalArithmeticOpenZeppelin.sol
• src/lib/LibFixedPointDecimalStrings.sol
• src/lib/format/LibFixedPointDecimalFormat.sol
• test/src/lib/FixedPointDecimalArithmeticOpenZeppelin.t.sol

---

Walkthrough

OpenZeppelin contracts dependency is upgraded from version 4.8.3 to 5.6.1. The Foundry configuration and remappings specify the new version, and all library imports in source files and tests are updated to reference the v5.6.1 paths.

Changes

OpenZeppelin v4.8.3 → v5.6.1 Upgrade

Layer / File(s)	Summary
Dependency Configuration foundry.toml, remappings.txt	@openzeppelin-contracts dependency version updated from 4.8.3 to 5.6.1; remapping path updated to @openzeppelin-contracts-5.6.1/.
Library Imports src/lib/LibFixedPointDecimalArithmeticOpenZeppelin.sol, src/lib/LibFixedPointDecimalStrings.sol, src/lib/format/LibFixedPointDecimalFormat.sol	Math and Strings imports updated to use OpenZeppelin v5.6.1; library logic and public interfaces remain unchanged.
Test Imports test/src/lib/FixedPointDecimalArithmeticOpenZeppelin.t.sol	Math import updated to v5.6.1; test logic and assertions remain unchanged.

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely summarizes the main change: upgrading OpenZeppelin Contracts from version 4.8.3 to 5.6.1 across the codebase.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-10-oz-5.6.1

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