Removes pydot2 dependency

[Ankit-Dhankhar]

This PR fixes #1488

This PR removes dependency on pydot2 which throws error while installing using pip due to incompibility of setuptools (>v58) with use_2to3 (ref stackoverflow link).

More details about the issue can be found in referenced issue #1488

PR Checklist

• There is an informative high-level description of the changes.
• The description and/or commit message(s) references the relevant GitHub issue(s).
• pre-commit is installed and set up.
• The commit messages follow these guidelines.
• The commits correspond to relevant logical changes, and there are no commits that fix changes introduced by other commits in the same branch/BR.

[brandonwillard]

Thanks, @Ankit-Dhankhar!