Merge #245

245: Update astroid to 2.7.3 r=YourLocalBlake a=pyup-bot


This PR updates [astroid](https://pypi.org/project/astroid) from **2.7.2** to **2.7.3**.



<details>
  <summary>Changelog</summary>
  
  
   ### 2.7.3
   ```
   ============================
Release date: 2021-08-30

* The transforms related to a module are applied only if this module has not been explicitly authorized to be imported
  (i.e is not in AstroidManager.extension_package_whitelist). Solves the following issues if numpy is authorized to be imported
  through the `extension-pkg-allow-list` option.

  Closes PyCQA/pylint3342
  Closes PyCQA/pylint4326

* Fixed bug in attribute inference from inside method calls.

    Closes PyCQA/pylint400

* Fixed bug in inference for superclass instance methods called
  from the class rather than an instance.

    Closes 1008
    Closes PyCQA/pylint4377

* Fixed bug in inference of chained attributes where a subclass
  had an attribute that was an instance of its superclass.

    Closes PyCQA/pylint4220

* Adds a brain for the ctypes module.

  Closes PyCQA/pylint4896

* When processing dataclass attributes, exclude the same type hints from abc.collections
  as from typing.

  Closes PyCQA/pylint4895

* Apply dataclass inference to pydantic&#39;s dataclasses.

  Closes PyCQA/pylint4899
   ```
   
  
</details>


 

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/astroid
  - Changelog: https://pyup.io/changelogs/astroid/
  - Repo: https://github.com/PyCQA/astroid
</details>



Co-authored-by: pyup-bot <github-bot@pyup.io>

pylint-requirements.txt

@@ -1,2 +1,2 @@
-astroid==2.7.2
+astroid==2.7.3
 pylint==2.10.2