Merge pull request matplotlib#29996 from meeseeksmachine/auto-backport-of-pr-29995-on-v3.10.x

Backport PR matplotlib#29995 on branch v3.10.x (Fix typo: missing singlequote in unrecognized backend exception)

Author: rcomer

lib/matplotlib/backends/registry.py

@@ -407,7 +407,7 @@ def resolve_gui_or_backend(self, gui_or_backend):
             return self.resolve_backend(gui_or_backend)
         except Exception:  # KeyError ?
             raise RuntimeError(
-                f"'{gui_or_backend} is not a recognised GUI loop or backend name")
+                f"'{gui_or_backend}' is not a recognised GUI loop or backend name")
 
 
 # Singleton