chore(tests): pin cbor2 until we decide wrt exception handling

[vytas7]

It seems in the newly released 6.0.x, cbor2.CBORDecodeError is not a subclass of ValueError.

I have reported this upstream: agronholm/cbor2#299. Let's see what happens there; maybe we don't need to do anything, just wait for a new release. Otherwise we may need to adapt the tests, or stop testing cbor2 altogether.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (e9e1d4b) to head (ae01705).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2640   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           64        64           
  Lines         7976      7976           
  Branches      1102      1102           
=========================================
  Hits          7976      7976           

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