Fix type checking tests

[francium]

I think mypy or pytest-mypy-plugins updated for python > 3.9, which changed union messages from Union[...] to |.

I also tried,

if sys.version_info >= (3, 10):                                                                                                                                                                                                                                              
    result_int_type = result_float_exc  # E: Incompatible types in assignment (expression has type "Ok[float] | Err[Exception]", variable has type "Ok[int] | Err[TypeError]")  [assignment]
else:                                                                                                                               
    result_int_type = result_float_exc  # E: Incompatible types in assignment (expression has type "Union[Ok[float], Err[Exception]]", variable has type "Union[Ok[int], Err[TypeError]]")  [assignment]

But that didn't seem to work locally on python 3.11

For now I'm just disabling type checking tests for <= 3.9

[codecov-commenter]

Codecov Report

Merging #124 (4594f31) into master (29af868) will not change coverage.
The diff coverage is 100.00%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #124   +/-   ##
=======================================
  Coverage   98.96%   98.96%           
=======================================
  Files           3        3           
  Lines         385      385           
=======================================
  Hits          381      381           
  Misses          4        4           

Impacted Files	Coverage Δ
src/result/__init__.py	100.00% <100.00%> (ø)