chore(deps): update rust crate once_cell to v1.20.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
once_cell	workspace.dependencies	patch	1.20.0 -> 1.20.2

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Release Notes

matklad/once_cell (once_cell)

v1.20.2

Compare Source

• 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

Compare Source

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

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