fix(deps): update rust crate constant_time_eq to 0.3.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
constant_time_eq	dependencies	minor	0.2.4 -> 0.3.0

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Release Notes

cesarb/constant_time_eq (constant_time_eq)

v0.3.0

Compare Source

• Use black_box instead of volatile read when inline assembly is not
  available.
• Increase minimum Rust version to 1.66, which is when black_box was
  stabilized.

v0.2.6

Compare Source

• New tests using the count_instructions crate; no functional changes.

v0.2.5

Compare Source

• Add #[must_use] to all functions.

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