Small cleanup: mypy type-ignore and dev deps #2938

Job	Run time
lint_typecheck_test_webui	1m 51s
Always - Docker verify, push to tag 'master' if on master	0s
Windows	3m 15s
ruff	10s
mypy	24s
Linux	2m 55s
3.12	7m 29s
3.11	7m 25s
3.10	7m 39s
3.9	7m 36s
PyPI - Publish if this is a tagged commit	0s
PyPI - Publish prerelease on merge commit on master	0s
Tagged - Docker push to tag based on git tag. Also push 'latest' if on master	0s
	38m 44s

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