build-system/pyproject: Remove python-pytest-flake8 native-input.

* gnu/packages/bioinformatics.scm (python-muon)
* gnu/packages/check.scm (python-pytest-perf)
* gnu/packages/dav.scm (radicale)
* gnu/packages/debug.scm (c-vise)
[native-inputs]: Remove python-pytest-flake8.

Signed-off-by: Sharlatan Hellseher <sharlatanus@gmail.com>

gnu/packages/check.scm

@@ -2957,7 +2957,6 @@ mypy plugins.")
      (list python-pytest
            python-pytest-checkdocs
            python-pytest-enabler
-           python-pytest-flake8
            python-pytest-mypy
            python-setuptools
            python-wheel))

gnu/packages/dav.scm

@@ -143,7 +143,6 @@ CardDAV server with a local folder or file.")
     (build-system pyproject-build-system)
     (native-inputs
      (list python-pytest
-           python-pytest-flake8
            python-setuptools
            python-waitress
            python-wheel))

gnu/packages/debug.scm

@@ -275,7 +275,7 @@ simple way to add custom protocol messages.")
        (file-name (git-file-name name version))))
     (build-system cmake-build-system)
     (native-inputs
-     (list flex python-pytest python-pytest-flake8))
+     (list flex python-pytest))
     (inputs
      (list bash-minimal clang llvm unifdef
            python python-pebble python-psutil python-chardet))