Fix newly exposed mypy issues

[uri-granta]

PR type: bugfix

Related issue(s)/PRs:

Summary

Fix mypy issues exposed by recent third party package updates.

Release notes

Fully backwards compatible: yes

PR checklist

• New features: code is well-documented
  • detailed docstrings (API documentation)
  • notebook examples (usage demonstration)
• The bug case / new feature is covered by unit tests
• Code has type annotations
• Build checks
  • I ran the black+isort formatter (make format)
  • I locally tested that the tests pass (make check-all)
• Release management
  • RELEASE.md updated with entry for this change
  • New contributors: I've added myself to CONTRIBUTORS.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b716d22) 98.19% compared to head (cb73cec) 98.19%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2094   +/-   ##
========================================
  Coverage    98.19%   98.19%           
========================================
  Files           97       97           
  Lines         5486     5486           
========================================
  Hits          5387     5387           
  Misses          99       99           

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[khurram-ghani]

Looks good.