MAINT: stop blank filtering out deprecation warnings

Filter them out in user_context_mgr instead.

scpdt/plugin.py

@@ -259,10 +259,7 @@ def run(self, test, compileflags=None, out=None, clear_globs=False):
             with np_errstate():
                 with config.dt_config.user_context_mgr(test):
                     with matplotlib_make_nongui():
-                        # XXX: might want to add the filter to `testmod`, too
-                        with warnings.catch_warnings():
-                            warnings.filterwarnings("ignore", category=DeprecationWarning)
-                            super().run(test, compileflags=compileflags, out=out, clear_globs=clear_globs)
+                        super().run(test, compileflags=compileflags, out=out, clear_globs=clear_globs)
 
         """
         Almost verbatim copy of `_pytest.doctest.PytestDoctestRunner` except we utilize