Fix mypy's worries that exc.response may be None

[cclauss]

https://github.com/jjjake/internetarchive/actions are currently failing because mypy is worried that exc.response could be None. Let's fix that to placate mypy and add 1 line to our max statements limit so that pre-commit tests are green again ✅ .

Note that pre-commit autoupdate should be run in a separate pull request to upgrade our linting tools. This should be done every few months or automated by enabling https://pre-commit.ci as is done in Open Library.

% pre-commit autoupdate

[https://github.com/pre-commit/pre-commit-hooks] updating v4.4.0 -> v4.5.0
[https://github.com/charliermarsh/ruff-pre-commit] updating v0.0.269 -> v0.1.5
[https://github.com/psf/black] updating 23.3.0 -> 23.11.0
[https://github.com/codespell-project/codespell] updating v2.2.4 -> v2.2.6
[https://github.com/pre-commit/mirrors-mypy] updating v1.3.0 -> v1.7.0
[https://github.com/asottile/setup-cfg-fmt] updating v2.2.0 -> v2.5.0