Update mypy requirement from ^0.931 to ^1.2

[dependabot[bot]]

Updates the requirements on mypy to permit the latest version.

Commits

• 4f47dfb Promote version to 1.2.0 and drop +dev from the version
• 06aa182 [dataclass_transform] support implicit default for "init" parameter in field ...
• 7beaec2 Support descriptors in dataclass transform (#15006)
• a7a995a Multiple inheritance considers callable objects as subtypes of functions (#14...
• 7f2a5b5 [dataclass_transform] fix deserialization for frozen_default
• bfa9eac [mypyc] Be stricter about function prototypes (#14942)
• 4e6d683 [mypyc] Document native floats and integers (#14927)
• aa2679b [mypyc] Fixes to float to int conversion (#14936)
• 9944d5f [mypyc] Support iterating over a TypedDict (#14747)
• 1a8ea61 [mypyc] Avoid boxing/unboxing when coercing between tuple types (#14899)
• Additional commits viewable in compare view

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