Cleanup: remove unused import and "using for"

[Fibonacci747]

Remove the unused Strings import and using directive from ERC721URIStorage and ERC1155URIStorage. These extensions do not call Strings utilities; URI composition uses string.concat or defers to super where Strings is already used in the base contract. This reduces minor clutter without affecting behavior

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Latest commit: e03c2bc

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[coderabbitai]

Walkthrough

The Strings library import and using Strings for uint256 directive have been removed from two URI storage extension contracts: ERC1155URIStorage.sol and ERC721URIStorage.sol. This eliminates the uint256 extension provided by the Strings library from both contracts. The public interfaces and token URI logic remain unchanged, continuing to handle tokenURI storage and base URI concatenation as before. Compilation now proceeds without the explicit Strings library dependency.

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly explains the purpose and scope of the changes, detailing which files are affected and why the Strings import is unnecessary.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The PR title 'Cleanup: remove unused import and "using for"' directly and accurately summarizes the main change: removing unused Strings import and using directives from the two storage contracts.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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