Bump `crypto-bigint` to 0.6.0-pre.5

[fjarri]

• Update for the changes in the API. In particular, all bit_length parameters are of type u32 now.
• Use Odd where appropriate.
• Bump MSRV to 1.73 to match crypto-bigint.

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (2379c91) 98.56% compared to head (685a6ee) 99.21%.

Files	Patch %	Lines
src/hazmat/lucas.rs	99.31%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #38 +/- ## ========================================== + Coverage 98.56% 99.21% +0.65% ========================================== Files 9 9 Lines 1323 1402 +79 ========================================== + Hits 1304 1391 +87 + Misses 19 11 -8 ```

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