[1.9.x] Fixed numpy deprecation warning silencing in template_tests.

Backport of 418658f453bed7fe7949dda26651aab370003e6a from master

tests/template_tests/syntax_tests/test_numpy.py

@@ -7,6 +7,7 @@ from ..utils import setup
 
 try:
     import numpy
+    VisibleDeprecationWarning = numpy.VisibleDeprecationWarning
 except ImportError:
     numpy = False
 
@@ -14,11 +15,12 @@ except ImportError:
 @skipIf(numpy is False, "Numpy must be installed to run these tests.")
 class NumpyTests(SimpleTestCase):
     # Ignore numpy deprecation warnings (#23890)
+    if numpy:
         warnings.filterwarnings(
             "ignore",
             "Using a non-integer number instead of an "
             "integer will result in an error in the future",
-        DeprecationWarning
+            numpy.VisibleDeprecationWarning
         )
 
     @setup({'numpy-array-index01': '{{ var.1 }}'})