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]

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 ⚠️

Additional details and impacted files

@@            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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