build: bump rust toolchain to 1.93

[pamburus]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.05%. Comparing base (3a0c349) to head (779ae96).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1358      +/-   ##
==========================================
+ Coverage   90.01%   90.05%   +0.03%     
==========================================
  Files          72       72              
  Lines       12291    12284       -7     
==========================================
- Hits        11064    11062       -2     
+ Misses       1227     1222       -5     

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