Update Rust crate once_cell to v1.20.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
once_cell	dependencies	minor	1.19.0 -> 1.20.3

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Release Notes

matklad/once_cell (once_cell)

v1.20.3

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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

Compare Source

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Rust Benchmark

Benchmark suite	Current: 78379bf	Previous: 4d39298	Ratio
rule-match-browserlike/brave-list	1728054555 ns/iter (± 11243401)	1747067148 ns/iter (± 27669849)	0.99
rule-match-first-request/brave-list	987896 ns/iter (± 16088)	984611 ns/iter (± 8271)	1.00
blocker_new/brave-list	202463418 ns/iter (± 2002857)	202003476 ns/iter (± 3378955)	1.00

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