Remove gas optimization changeset entries (#4889)

.changeset/angry-dodos-grow.md

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-'openzeppelin-solidity': minor
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-`Math`: Optimized gas cost of `ceilDiv` by using `unchecked`.

.changeset/brown-cooks-dress.md

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-'openzeppelin-solidity': patch
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-`Checkpoints`: Optimized checkpoint access by removing redundant memory usage.