chore: remove unnecessary type checking

[Ian2012]

Closes: #152

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[pomegranited]

👍 Cool, I guess mypy fixed their bug? Thanks for addressing this issue @Ian2012 :)

CC @kdmccormick @ormsbee

• I tested this by:
  • Running this change in my tutor dev stack while adding assets to library v2 components
  • Ensuring that mypy is checking this file and no longer complains about this issue.
• I read through the code
• I checked for accessibility issues N/A
• Includes documentation N/A
• User-facing strings are extracted for translation N/A

[kdmccormick]

This would not be the first time that a typing issue went away just by letting mypy or django-stubs get updated. Thanks!

I did not test, but I don't see a need to given that these annotations aren't evaluated at runtime.