BUG: workaround failure of pandas-dev#17378 on Windows

Author: toobaz

pandas/core/indexes/base.py

@@ -2755,6 +2755,8 @@ def union(self, other):
                                            allow_fill=False)
                 result = _concat._concat_compat((lvals, other_diff))
 
+                # Workaround failure of #17378 on Windows
+                lvals[0] < other_diff[0]
             else:
                 result = lvals