fix(deps): update rust crate constant_time_eq to 0.3.0

[renovate[bot]]

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`](https://togithub.com/cesarb/constant_time_eq/blob/HEAD/CHANGES#030) [Compare Source](https://togithub.com/cesarb/constant_time_eq/compare/0.2.6...0.3.0) - 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`](https://togithub.com/cesarb/constant_time_eq/blob/HEAD/CHANGES#026) [Compare Source](https://togithub.com/cesarb/constant_time_eq/compare/0.2.5...0.2.6) - New tests using the count_instructions crate; no functional changes. ### [`v0.2.5`](https://togithub.com/cesarb/constant_time_eq/blob/HEAD/CHANGES#025) [Compare Source](https://togithub.com/cesarb/constant_time_eq/compare/0.2.4...0.2.5) - Add #\[must_use] to all functions.

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