Fix use of unittest.TestCase.assertEquals

This MR replaces uses of unittest.TestCase.assertEquals with assertEqual; the former usage was deprecated in Python 3.2 and removed in Python 3.12.

src/python/foton/pydmtsigp_test.py

@@ -743,18 +743,18 @@ class TestFotonMethods(unittest.TestCase):
         self.assertTrue(sigp.isiir(self.iir_filter))
 
     def test_iirsoscount(self):
-        self.assertEquals(sigp.iirsoscount(self.iir_filter), 1)
+        self.assertEqual(sigp.iirsoscount(self.iir_filter), 1)
 
     def test_iirpolecount(self):
-        self.assertEquals(sigp.iirpolecount(self.iir_filter), 1)
+        self.assertEqual(sigp.iirpolecount(self.iir_filter), 1)
 
     def test_iirzerocount(self):
-        self.assertEquals(sigp.iirzerocount(self.iir_filter), 1)
+        self.assertEqual(sigp.iirzerocount(self.iir_filter), 1)
 
     def test_iirpolezerocount(self):
         poles, zeros = sigp.iirpolezerocount(self.iir_filter)
-        self.assertEquals(poles, 1)
-        self.assertEquals(zeros, 1)
+        self.assertEqual(poles, 1)
+        self.assertEqual(zeros, 1)
 
     def test_iirorder(self):
         print(f"iirorder={sigp.iirorder(self.iir_filter)}")