[FIX] Issue with Optional parameters that are inherited

[ncilfone]

What does this PR do?

fixed issue with inheritance of Optional classes with the new lazy base classes

Checklist

• Did you adhere to PEP-8 standards?
• Did you run black and isort prior to submitting your PR?
• Does your PR pass all existing unit tests?
• Did you add associated unit tests for any additional functionality?
• Did you provide documentation (Google Docstring format) whenever possible, even for simple functions or classes?

[coveralls]

Pull Request Test Coverage Report for Build 1866527872

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.1%) to 96.104%

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Files with Coverage Reduction	New Missed Lines	%
spock/graph.py	1	94.17%

Totals
Change from base Build 1865855495:	0.1%
Covered Lines:	1776
Relevant Lines:	1848

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💛 - Coveralls