Fixes for Latest IPython (9.0.1) (mne-tools#13146)

Co-authored-by: Eric Larson <larson.eric.d@gmail.com>

Author: scott-huberty

mne/forward/forward.py

@@ -180,11 +180,11 @@ def _get_src_type_and_ori_for_repr(self):
         src_types = np.array([src["type"] for src in self["src"]])
 
         if (src_types == "surf").all():
-            src_type = "Surface with {self['nsource']} vertices"
+            src_type = f"Surface with {self['nsource']} vertices"
         elif (src_types == "vol").all():
-            src_type = "Volume with {self['nsource']} grid points"
+            src_type = f"Volume with {self['nsource']} grid points"
         elif (src_types == "discrete").all():
-            src_type = "Discrete with {self['nsource']} dipoles"
+            src_type = f"Discrete with {self['nsource']} dipoles"
         else:
             count_string = ""
             if (src_types == "surf").any():

mne/viz/backends/tests/test_abstract.py

@@ -127,5 +127,5 @@ def test_widget_abstraction_notebook(renderer_notebook, nbexec):
     assert Path(backend.__file__).stem == "_notebook"
 
     ipython = get_ipython()
-    ipython.magic("%matplotlib widget")
+    ipython.run_line_magic(magic_name="matplotlib", line="widget")
     _do_widget_tests(backend)