Update Rust crate tokio to 1.52.3

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
tokio (source)	dependencies	patch	1.52.2 → 1.52.3

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Release Notes

tokio-rs/tokio (tokio)

v1.52.3: Tokio v1.52.3

Compare Source

1.52.3 (May 8th, 2026)

Fixed

• sync: fix underflow in mpsc channel len() (#​8062)
• sync: notify receivers in mpsc OwnedPermit::release() method (#​8075)
• sync: require that an RwLock has max_readers != 0 (#​8076)
• sync: return Empty from try_recv() when mpsc is closed with outstanding permits (#​8074)

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