py-mypy: updated to 0.660

0.660:
- Literal Types
- Quick Mode Removed
- Plugin Improvements
  * Add documentation for plugin system
  * Make name lookup available to all plugin hooks
  * Add more information to FunctionContext and MethodContext
- Other Improvements and Notable Bugs Fixed
  * Introduce an optional sqlite backed incremental cache, enabled with --sqlite-cache
  * Fix a daemon crash when there is a decode error
  * Allow setting python_executable from config file
  * Short-circuit if expression for always true/always false variables and MYPY/TYPE_CHECKING
  * Don't map actual kwargs to formal *args
  * Disable cache when producing reports
  * Fix issues with pointer arrays in the ctypes plugin
  * Support kw_only=True in the attrs plugin
  * Fix some daemon crash bugs
  * Better error messages when __eq__ has unexpected signature
  * Collect additional timing stats and allow reporting them from the daemon
  * Fix dmypy run when bad options passed to mypy
  * Improve error messages from multiple inheritance compatibility checks
  * Fix an incremental mode crash that can occur in situations with import cycles and star imports

(adam)