ENH: irr: Compare dimensions only to two

We only need to check the 2d case. As this will never be a 1d array as ``np.atleast_2d`` was used.

numpy_financial/_financial.py

@@ -806,7 +806,7 @@ def irr(values, *, raise_exceptions=False, selection_logic=_irr_default_selectio
     
     """
     values = np.atleast_2d(values)
-    if values.ndim not in [1, 2]:
+    if values.ndim != 2:
         raise ValueError("Cashflows must be a 2D array")
 
     irr_results = np.empty(values.shape[0])