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/wallet.py

@@ -9,7 +9,6 @@ from decimal import Decimal
 from enum import Enum
 from typing import (
     Any,
-    List,
     Optional,
 )
 from test_framework.address import (
@@ -284,7 +283,7 @@ class MiniWallet:
     def create_self_transfer_multi(
         self,
         *,
-        utxos_to_spend: Optional[List[dict]] = None,
+        utxos_to_spend: Optional[list[dict]] = None,
         num_outputs=1,
         amount_per_output=0,
         locktime=0,