Remove pep8speaks (#8392)

.pep8speaks.yml

@@ -1,22 +0,0 @@
-# File : .pep8speaks.yml
-
-scanner:
-    diff_only: True  # If False, the entire file touched by the Pull Request is scanned for errors. If True, only the diff is scanned.
-    linter: pycodestyle  # Other option is flake8
-
-#pycodestyle:  # this is dropped in favor od unified config
-# see: https://github.com/OrkoHunter/pep8speaks/issues/95#issuecomment-470887715
-
-no_blank_comment: True  # If True, no comment is made on PR without any errors.
-descending_issues_order: False  # If True, PEP 8 issues in message will be displayed in descending order of line numbers in the file
-
-message:  # Customize the comment made by the bot,
-    opened:  # Messages when a new PR is submitted
-        header: "Hello @{name}! Thanks for opening this PR. "
-                # The keyword {name} is converted into the author's username
-        footer: "Do see the [Hitchhiker's guide to code style](https://goo.gl/hqbW4r)"
-                # The messages can be written as they would over GitHub
-    updated:  # Messages when new commits are added to the PR
-        header: "Hello @{name}! Thanks for updating this PR. "
-        footer: ""  # Why to comment the link to the style guide everytime? :)
-    no_errors: "There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: "

requirements/test.txt

@@ -1,10 +1,8 @@
 coverage>5.2.0
 codecov>=2.1
 pytest>=6.0
-flake8>=3.6
 check-manifest
 twine==3.2
-isort>=5.6.4
 mypy>=0.900
 pre-commit>=1.0