fix(deps): update rust crate constant_time_eq to 0.6.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
constant_time_eq	dependencies	minor	0.5.0 → 0.6.0

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Release Notes

cesarb/constant_time_eq (constant_time_eq)

v0.6.0

Compare Source

• The official repository for this project is now on Codeberg. The git
  repository on GitHub is still in use; issues and pull requests are
  accepted on either repository.
• The availability of stable inline assembly for the target architecture
  is now auto-detected based on the rustc version through a build script,
  which allowed lowering the MSRV again.
• The development-only count_instructions_test feature has been removed,
  and replaced with an environment variable. To run these tests (currently
  Linux-only), set COUNT_INSTRUCTIONS_TEST=1 when calling cargo test.

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