dev-python/pandas: remove unused patch

Signed-off-by: Michael Mair-Keimberger <mm1ke@gentoo.org>

dev-python/pandas/files/pandas-2.3.0-xarray-test.patch

@@ -1,48 +0,0 @@
-From 12b1d00622ffc8b99986da2f4478cc2df4da213a Mon Sep 17 00:00:00 2001
-From: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>
-Date: Mon, 5 May 2025 10:55:36 -0700
-Subject: [PATCH] Fix xarray failures post xarray unpin
-
----
- pandas/tests/generic/test_to_xarray.py | 13 +++++++++----
- 1 file changed, 9 insertions(+), 4 deletions(-)
-
-diff --git a/pandas/tests/generic/test_to_xarray.py b/pandas/tests/generic/test_to_xarray.py
-index 9fe9bca8abdc9..96b2936aadd83 100644
---- a/pandas/tests/generic/test_to_xarray.py
-+++ b/pandas/tests/generic/test_to_xarray.py
-@@ -6,6 +6,7 @@
-     DataFrame,
-     MultiIndex,
-     Series,
-+    StringDtype,
-     date_range,
- )
- import pandas._testing as tm
-@@ -51,9 +52,6 @@ def test_to_xarray_index_types(self, index_flat, df, using_infer_string):
-         # datetimes w/tz are preserved
-         # column names are lost
-         expected = df.copy()
--        expected["f"] = expected["f"].astype(
--            object if not using_infer_string else "str"
--        )
-         expected.columns.name = None
-         tm.assert_frame_equal(result.to_dataframe(), expected)
- 
-@@ -88,8 +86,15 @@ def test_to_xarray_with_multiindex(self, df, using_infer_string):
- 
- 
- class TestSeriesToXArray:
--    def test_to_xarray_index_types(self, index_flat):
-+    def test_to_xarray_index_types(self, index_flat, request):
-         index = index_flat
-+        if isinstance(index.dtype, StringDtype) and index.dtype.storage == "pyarrow":
-+            request.applymarker(
-+                pytest.mark.xfail(
-+                    reason="xarray calling reshape of ArrowExtensionArray",
-+                    raises=NotImplementedError,
-+                )
-+            )
-         # MultiIndex is tested in test_to_xarray_with_multiindex
- 
-         from xarray import DataArray