Explicitly close figures to avoid racking up memory

tests/test_live_view.py

@@ -134,6 +134,8 @@ def started(spectrometer, plot_timetrace, in_process, in_gitlab_ci):
         for view in views:
             view.process.terminate()
 
+    plt.close(spectrometer.fig)
+
 
 @pytest.fixture
 def stopped(started: list[LiveViewT], in_process: bool):