deps: bump openzeppelin-contracts 4.8.3 -> 5.6.1

[thedavidmeister]

Cascade-bump for the rain.math.float soldeer migration. OZ uses are test-only (toString uint/int via using Strings for uint256); 5.6.1 retains both overloads. forge t est passes 20/20.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 6f0c179e-9468-4cc5-a9da-90e518438691

📥 Commits

Reviewing files that changed from the base of the PR and between 6812643 and 635d718.

⛔ Files ignored due to path filters (1)

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

📒 Files selected for processing (4)

• foundry.toml
• remappings.txt
• test/src/lib/parse/LibParseDecimal.unsafeDecimalStringToInt.t.sol
• test/src/lib/parse/LibParseDecimal.unsafeDecimalStringToSignedInt.t.sol

✨ 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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