Update xfail velo tests for GMT 6.3 (#1657)

Author: Meghan Jones

pygmt/tests/baseline/test_velo_numpy_array_numeric_only.png.dvc

@@ -1,4 +1,4 @@
 outs:
-- md5: 64e45d586112fc131090cfac2c104b63
-  size: 45483
+- md5: 852dba2075122641e3785603207f9b88
+  size: 44362
   path: test_velo_numpy_array_numeric_only.png

pygmt/tests/baseline/test_velo_pandas_dataframe.png.dvc

@@ -1,4 +1,4 @@
 outs:
-- md5: 60dff1a72e6d984f095fb4973cecaec7
-  size: 42430
+- md5: 136a1b34e8ad58de070a83ed3941276e
+  size: 42906
   path: test_velo_pandas_dataframe.png

pygmt/tests/test_velo.py

@@ -30,10 +30,6 @@ def fixture_dataframe():
     )
 
 
-@pytest.mark.xfail(
-    condition=gmt_version > Version("6.2.0"),
-    reason="Upstream bug fixed by https://github.com/GenericMappingTools/gmt/pull/5360.",
-)
 @pytest.mark.mpl_image_compare
 def test_velo_numpy_array_numeric_only(dataframe):
     """
@@ -71,10 +67,6 @@ def test_velo_without_spec(dataframe):
         fig.velo(data=dataframe)
 
 
-@pytest.mark.xfail(
-    condition=gmt_version > Version("6.2.0"),
-    reason="Upstream bug fixed by https://github.com/GenericMappingTools/gmt/pull/5360.",
-)
 @pytest.mark.mpl_image_compare
 def test_velo_pandas_dataframe(dataframe):
     """