Ignore generated _version.py in flake8 configuration

dbnicholson · dbnicholson · commit a8d7024d8a5c · 2023-11-13T17:01:59.000-07:00
This is already ignored by pre-commit because it's not under version
control, but if you run bare `flake8` it will check it.
diff --git a/.flake8 b/.flake8
@@ -1,5 +1,6 @@
 [flake8]
 extend-exclude =
+  kolibri_explore_plugin/_version.py,
   build/,
   static/,
   dist/,
