Handle new matplotlib versions (#1791)

Fixes: #1623

Author: garymm

src/debugpy/_vendored/pydevd/pydev_ipython/matplotlibtools.py

@@ -53,10 +53,30 @@ def find_gui_and_backend():
     return gui, backend
 
 
+def _get_major_version(module):
+    return int(module.__version__.split('.')[0])
+
+
+def _get_minor_version(module):
+    return int(module.__version__.split('.')[1])
+
+
 def is_interactive_backend(backend):
     """Check if backend is interactive"""
     matplotlib = sys.modules["matplotlib"]
-    from matplotlib.rcsetup import interactive_bk, non_interactive_bk  # @UnresolvedImport
+    new_api_version = (3, 9)
+    installed_version = (
+        _get_major_version(matplotlib),
+        _get_minor_version(matplotlib)
+    )
+
+    if installed_version >= new_api_version:
+        interactive_bk = matplotlib.backends.backend_registry.list_builtin(
+            matplotlib.backends.BackendFilter.INTERACTIVE)
+        non_interactive_bk = matplotlib.backends.backend_registry.list_builtin(
+            matplotlib.backends.BackendFilter.NON_INTERACTIVE)
+    else:
+        from matplotlib.rcsetup import interactive_bk, non_interactive_bk  # @UnresolvedImport
 
     if backend in interactive_bk:
         return True