[C++] Bump mimalloc to 3.3.0+ #49772

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Component: C++Type: enhancement

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on Apr 16, 2026

Describe the enhancement requested

mimalloc 3.3.0 was just released with a bunch of potentially useful improvements or fixes. We should probably bump our bundled mimalloc build to the latest version.

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raulcd

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Component: C++Type: enhancement

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