Update crypto crates and fix sphinx issue

[simonwicky]

This PR aims to update the crypto crates used and fix a sphinx crypto issue

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.97590% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 59.02%. Comparing base (ca107d9) to head (2f30cde).

❗ Current head 2f30cde differs from pull request most recent head e9f9aad. Consider uploading reports for the commit e9f9aad to get more accurate results

Files	Patch %	Lines
src/packet/mod.rs	33.33%	2 Missing ⚠️
src/header/keys.rs	96.15%	1 Missing ⚠️
src/packet/builder.rs	50.00%	1 Missing ⚠️
src/surb/mod.rs	85.71%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##           develop      #94       +/-   ##
============================================
- Coverage    70.63%   59.02%   -11.62%     
============================================
  Files           21       20        -1     
  Lines         2268     2572      +304     
============================================
- Hits          1602     1518       -84     
- Misses         666     1054      +388     

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