adding IntpHashTable to hashtable.pyi

Author: realead

pandas/_libs/hashtable.pyi

@@ -212,6 +212,8 @@ class UInt32HashTable(HashTable): ...
 class UInt16HashTable(HashTable): ...
 class UInt8HashTable(HashTable): ...
 
+class IntpHashTable(HashTable): ...
+
 class StringHashTable(HashTable): ...
 class PyObjectHashTable(HashTable): ...