Bumps mypy from 1.2.0 to 1.3.0.
Commits
9df39ab set version to 1.3.0
c1464a9 Revert "Fix disappearing errors when re-running dmypy check (#14835)" (#15179)
d887e9c Fix performance in union subtyping (#15104)
320b883 Typeshed cherry-pick: stdlib/xml: fix return types for toxml/toprettyxml meth...
6a68049 Fix sys.platform when cross-compiling with emscripten (#14888)
3d9661c Fix bounded self types in override incompatibility checking (#15045)
0799a8...