Revert "Delete .venv directory"

This reverts commit 5a2693bd9f.

.venv/lib/python3.9/site-packages/matplotlib/backends/backend_qt4cairo.py

@@ -0,0 +1,11 @@
+from .. import _api
+from .backend_qt5cairo import _BackendQT5Cairo, FigureCanvasQTCairo
+
+
+_api.warn_deprecated("3.3", name=__name__, obj_type="backend")
+
+
+@_BackendQT5Cairo.export
+class _BackendQT4Cairo(_BackendQT5Cairo):
+    class FigureCanvas(FigureCanvasQTCairo):
+        required_interactive_framework = "qt4"