autotest: fix 'DeprecationWarning: 'count' is passed as positional argument'

cf https://github.com/OSGeo/gdal/actions/runs/12615376646/job/35155360375?pr=11572

Author: rouault

autotest/osr/osr_xml.py

@@ -180,8 +180,8 @@ def test_osr_xml_2():
     got = srs.ExportToXML()
 
     # Strip the gml:id tags
-    got = re.sub(r' gml:id="[^"]*"', "", got, 0)
-    expected = re.sub(r' gml:id="[^"]*"', "", expected, 0)
+    got = re.sub(r' gml:id="[^"]*"', "", got)
+    expected = re.sub(r' gml:id="[^"]*"', "", expected)
 
     assert got == expected