fix: Pin typeguard<4.3.0

[antonagestam]

typeguard 4.3.0 introduced refined support for protocol type checking, unfortunately this breaks some existing usages in phantom-types, which in turn breaks sized types. As there's seemingly no trivial way to work around the issue, this commit pins typeguard at 4.3.0 until there is a fix upstream.

#299

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.91%. Comparing base (0b2fcaa) to head (5314258).
Report is 34 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #300   +/-   ##
=======================================
  Coverage   98.91%   98.91%           
=======================================
  Files          27       27           
  Lines        1017     1018    +1     
  Branches      160      160           
=======================================
+ Hits         1006     1007    +1     
  Misses         11       11           

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