Moved owner check from public to internal function in ERC721 contract…

[ViharGandhi]

… - resolves issue #4136

Updated ERC721._approve function to include a check for the owner before approval is granted. This ensures that the owner is not accidentally approved and prevents unnecessary sload calls. Moved the check from the public ERC721.approve function to the internal ERC721._approve function. Resolves issue #4136.

Fixes #????

PR Checklist

• [ ] Tests
• [ ] Documentation
• [ ] Changeset entry (run npx changeset add)

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Latest commit: f097c8d2c1a5c379294f2b716abee4418cf8a077

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[ernestognw]

For reference, there's also another PR for this. 👍🏻 to @Amxx comments.

I'd also suggest adding a Changelog entry, it's technically breaking and I think it's valuable to have an entry