Fix AssertionError in "testForceSourceShape"

1) Not sure why this pops up now, some rounding error which did not occur before; still equal up to and including 6 digits.
2) Only a problem with Python 3.12

Author: HannoSpreeuw

test/test_image.py

@@ -458,8 +458,8 @@ def testForceSourceShape(self):
             FitsImage(GRB120422A), conf=conf
         )
         results = image.extract()
-        self.assertEqual(results[0].smaj.value, image.beam[0])
-        self.assertEqual(results[0].smin.value, image.beam[1])
+        self.assertAlmostEqual(results[0].smaj.value, image.beam[0], places=6)
+        self.assertAlmostEqual(results[0].smin.value, image.beam[1], places=6)
 
     @requires_data(os.path.join(DATAPATH, "SWIFT_554620-130504.fits"))
     @requires_data(os.path.join(DATAPATH, "SWIFT_554620-130504.image"))