remove unused convert_sql_column (#19363)

Author: jbrockmendel

pandas/_libs/src/inference.pyx

@@ -1389,10 +1389,6 @@ def maybe_convert_objects(ndarray[object] objects, bint try_float=0,
     return objects
 
 
-def convert_sql_column(x):
-    return maybe_convert_objects(x, try_float=1)
-
-
 def sanitize_objects(ndarray[object] values, set na_values,
                      convert_empty=True):
     cdef: