feh: Update to 3.2.1

Changes:

* Use --no-fehbg option in ~/.fehbg. This fixes cases where an X11 setup
  change may inadvertently alter the commandline stored in .fehbg.
* Fix insufficient error handling when updating ~/.fehbg. Previously, a
  stat() error may have caused .fehbg to be update with excessive file
  permissions (patch by Tobias Stoeckmann)
* Fix TOCTTOU when setting the file mode of ~/.fehbg (patch by Tobias
  Stoeckmann)

(nia)