Import BackendFilter from backends.registry

Author: SilkeSchomann

src/mslice/plotting/pyplot.py

@@ -75,7 +75,8 @@
 from matplotlib.artist import Artist
 from matplotlib.axes import Axes
 from matplotlib.axes import Subplot  # noqa: F401
-from matplotlib.backends import BackendFilter, backend_registry
+from matplotlib.backends import backend_registry
+from matplotlib.backends.registry import BackendFilter
 from matplotlib.projections import PolarAxes
 from matplotlib import mlab  # for detrend_none, window_hanning
 from matplotlib.scale import get_scale_names  # noqa: F401