Update dependency mypy to v1.8.0

This MR contains the following updates:

Package	Type	Update	Change
mypy (source, changelog)	lint	minor	1.6.0 -> 1.8.0

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Release Notes

python/mypy (mypy)

v1.8.0

Compare Source

v1.7.1

Compare Source

v1.7.0

Compare Source

v1.6.1

Compare Source

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