fix(spy): handle properties that return primitive types

[mcous]

Trying to get the signature of an @property that is typed with something like int or str will cause decoy to raise an error from inspect.signature. This PR fixes that issue.

This was a regression introduced in #108 which narrowed the except around inspect.signature from Exception to TypeError. As stated in the Python docs, inspect.signature:

Raises ValueError if no signature can be provided, and TypeError if that type of object is not supported.

[codecov]

Codecov Report

Merging #132 (32b1e90) into main (184ec01) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #132   +/-   ##
=======================================
  Coverage   98.29%   98.29%           
=======================================
  Files          19       19           
  Lines         704      704           
  Branches      120      120           
=======================================
  Hits          692      692           
  Misses         10       10           
  Partials        2        2           

Impacted Files	Coverage Δ
decoy/spec.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 184ec01...32b1e90. Read the comment docs.