fix var shadowing (#17858)
Raised in
https://github.com/nvaccess/nvda/pull/17809#discussion_r1989030683
Summary of the issue:
There is variable name shadowing for `dict` in our `AutoPropertyType`
initializers. `ABCMeta` uses the term `namespace` instead of `dict` to
avoid this conflict.
Description of user facing changes
None
Description of development approach
replace variable usages
