test/static-code: drop flake8

`ruff` in preview mode now implements the various E[123] rules that we
were depending on flake8 for.  Drop it.

.flake8

@@ -1,8 +0,0 @@
-[flake8]
-# Use flake8 only to cover rules not yet supported (or enabled by
-# default) with ruff.  See https://github.com/astral-sh/ruff/issues/2402
-# and https://github.com/astral-sh/ruff/releases/tag/v0.0.269
-select=
-  E1
-  E2
-  E3

HACKING.md

@@ -525,7 +525,7 @@ For running tests, the following dependencies are required:
 
     sudo dnf install curl expect xz rpm-build chromium-headless dbus-daemon \
         libvirt-daemon-driver-storage-core libvirt-daemon-driver-qemu libvirt-client python3-libvirt \
-        python3-flake8 python3-pyyaml
+        python3-pyyaml
 
 For compiling the C parts, you will need the package build dependencies:
 

pyproject.toml

@@ -142,7 +142,6 @@ wheel_build_env = venv-pkg
 skip_install = lint: True
 deps =
   lint: mypy
-  lint: flake8
   lint: ruff
   lint: vulture
   pytest

test/static-code

@@ -1,9 +1,8 @@
 #!/bin/bash
-# run static code checks like eslint, flake8, mypy, ruff, vulture.
+# run static code checks like eslint, mypy, ruff, vulture.
 
 set -eu
 
-# requires: .flake8
 # requires: pyproject.toml
 # requires: containers/flatpak/test/ruff.toml
 # requires: pkg/ruff.toml
@@ -34,11 +33,6 @@ find_python_files() {
     find_scripts 'python3' '*.py'
 }
 
-test_flake8() {
-    command -v flake8 >/dev/null || skip 'no flake8'
-    find_python_files | xargs -r -0 flake8
-}
-
 test_ruff() {
     command -v ruff >/dev/null || skip 'no ruff'
     find_python_files | xargs -r -0 ruff check --quiet --no-cache