TST: Reduce memory pressure of plotting tests (pandas-dev#53660)

* TST: Reduce memory pressure of plotting tests

* Trigger ci

* Remove gc call

Author: mroeschke

pandas/tests/plotting/conftest.py

@@ -7,6 +7,13 @@
 )
 
 
+@pytest.fixture(autouse=True)
+def non_interactive():
+    mpl = pytest.importorskip("matplotlib")
+    mpl.use("template")
+    yield
+
+
 @pytest.fixture(autouse=True)
 def reset_rcParams():
     mpl = pytest.importorskip("matplotlib")
@@ -16,8 +23,11 @@ def reset_rcParams():
 
 @pytest.fixture(autouse=True)
 def close_all_figures():
+    # https://stackoverflow.com/q/31156578
     yield
     plt = pytest.importorskip("matplotlib.pyplot")
+    plt.cla()
+    plt.clf()
     plt.close("all")