deps: update rust crate once_cell to v1.20.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
once_cell	dependencies	minor	1.16.0 -> 1.20.2

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Release Notes

matklad/once_cell (once_cell)

v1.20.2

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• Remove portable_atomic from Cargo.lock if it is not, in fact, used: #​267
  This is a work-around for this cargo bhttps://github.com/rust-lang/cargo/issues/108010801.

v1.20.1

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• Allow using race module using just portable_atomic, without critical_section and provide
  better error messages on targets without atomic CAS instruction,
  #​265.

v1.20.0

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v1.19.0

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• Use portable-atomic instead of atomic-polyfill, #​251.

v1.18.0

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• MSRV is updated to 1.60.0 to take advantage of dep: syntax for cargo features,
  removing "implementation details" from publicly visible surface.

v1.17.2

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• Avoid unnecessary synchronization in Lazy::{force,deref}_mut(), #​231.

v1.17.1

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• Make OnceRef implementation compliant with strict provenance.

v1.17.0

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• Add race::OnceRef for storing a &'a T.

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