test: use built-in collection types for type hints (Python 3.9 / PEP 585)

Since Python 3.9, type hinting has become a little less awkward, as for
collection types one doesn't need to import the corresponding
capitalized types (`Dict`, `List`, `Set`, `Tuple`, ...) anymore, but can
use the built-in types directly. [1] [2]
This commit applies the replacement for all Python scripts (i.e. in the
contrib and test folders) for the basic types:
    - typing.Dict  -> dict
    - typing.List  -> list
    - typing.Set   -> set
    - typing.Tuple -> tuple

[1] https://docs.python.org/3.9/whatsnew/3.9.html#type-hinting-generics-in-standard-collections
[2] https://peps.python.org/pep-0585/#implementation for a list of type

test/functional/test_framework/script.py

@@ -10,7 +10,6 @@ This file is modified from python-bitcoinlib.
 from collections import namedtuple
 import struct
 import unittest
-from typing import List, Dict
 
 from .key import TaggedHash, tweak_add_pubkey, compute_xonly_pubkey
 
@@ -110,8 +109,8 @@ class CScriptOp(int):
             _opcode_instances.append(super().__new__(cls, n))
             return _opcode_instances[n]
 
-OPCODE_NAMES: Dict[CScriptOp, str] = {}
-_opcode_instances: List[CScriptOp] = []
+OPCODE_NAMES: dict[CScriptOp, str] = {}
+_opcode_instances: list[CScriptOp] = []
 
 # Populate opcode instance table
 for n in range(0xff + 1):