fix: If data.type is None but has data.properties, assume type is object

[ahuang11]

Closes #674

Not entirely sure if I did the end to end testing correctly since I got:

end_to_end_tests: task regen
Generating my-test-api-client

Usage: openapi-python-client update [OPTIONS]
Try 'openapi-python-client update --help' for help.
╭─ Error ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ Invalid value: Unable to parse config

But it generated the test files and the task e2e succeeded.

[codecov]

Codecov Report

Merging #691 (b91bed3) into main (9b983a0) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #691   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           49        49           
  Lines         1946      1946           
=========================================
  Hits          1946      1946           

Impacted Files	Coverage Δ
...penapi_python_client/parser/properties/__init__.py	100.00% <100.00%> (ø)

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[dbanty]

Looks great, thanks for fixing this!!