Update SGX SDK to 2.23

[nick-mobilecoin]

The DCAP diff can be seen here, intel/SGXDataCenterAttestationPrimitives@DCAP_1.19...DCAP_1.20

The main SDK changes can be seen here, intel/linux-sgx@sgx_2.22...sgx_2.23

[nick-mobilecoin]

• Update SGX SDK to 2.23 #492 👈
• Update elliptic-curve and shlex #490
• Fix newer clippy warnings #491
• main

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.37%. Comparing base (9c61343) to head (232cddc).

Additional details and impacted files

@@                     Coverage Diff                      @@
##           nick/fix-elliptic-curve-dep     #492   +/-   ##
============================================================
  Coverage                        88.37%   88.37%           
============================================================
  Files                               40       40           
  Lines                             5266     5266           
============================================================
  Hits                              4654     4654           
  Misses                             612      612           

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[holtzman]

Thanks for the explanations on the changes!