CI: do not install xarray on 3.5.x branch

tacaswell · tacaswell · commit 1e23977eacde · 2022-04-27T15:37:38.000-04:00
The version of xarray that support py37 raises warnings due to
setuptools/distuitls deprecation warnings.
diff --git a/requirements/testing/extra.txt b/requirements/testing/extra.txt
@@ -7,4 +7,3 @@ pandas!=0.25.0
 pikepdf
 pytz
 pywin32; sys.platform == 'win32'
-xarray

-Original file line number
+Diff line change
 pikepdf
 pytz
 pywin32; sys.platform == 'win32'
 -xarray