[DOP-11371] Fix @slot decorator

[dolfinus]

Change Summary

It looks like Pylance (VS Code extension for Python) does not recognize typing_extensions.ParamSpec.

With ParamsSpec:

Without:

ParamSpec is a recommended way to tell linters how inputs of callable: Callable[Spec, ReturnType] are passed to def new_callable(*Spec.args, **Spec.kwargs) -> ReturnType:.
Fortunately, there is another (but less precise) way to describe this - Callable[..., ReturnType]. This is used for now.

Related issue number

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4092134) 94.08% compared to head (4d268c1) 94.05%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #183      +/-   ##
===========================================
- Coverage    94.08%   94.05%   -0.03%     
===========================================
  Files          205      205              
  Lines         7744     7742       -2     
  Branches      1400     1400              
===========================================
- Hits          7286     7282       -4     
- Misses         332      333       +1     
- Partials       126      127       +1     

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