Update cbor2 dependency

[vEpiphyte]

Addresses https://github.com/vertexproject/synapse/security/dependabot/26

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.71%. Comparing base (d280f44) to head (a2ded35).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4648      +/-   ##
==========================================
+ Coverage   97.68%   97.71%   +0.03%     
==========================================
  Files         295      295              
  Lines       62058    62058              
==========================================
+ Hits        60623    60643      +20     
+ Misses       1435     1415      -20     

Flag	Coverage Δ
linux	97.64% <ø> (-0.01%)	⬇️
linux_replay	93.37% <ø> (+61.07%)	⬆️

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