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

contrib/devtools/test-symbol-check.py

@@ -7,18 +7,17 @@ Test script for symbol-check.py
 '''
 import os
 import subprocess
-from typing import List
 import unittest
 
 from utils import determine_wellknown_cmd
 
-def call_symbol_check(cc: List[str], source, executable, options):
+def call_symbol_check(cc: list[str], source, executable, options):
     # This should behave the same as AC_TRY_LINK, so arrange well-known flags
     # in the same order as autoconf would.
     #
     # See the definitions for ac_link in autoconf's lib/autoconf/c.m4 file for
     # reference.
-    env_flags: List[str] = []
+    env_flags: list[str] = []
     for var in ['CFLAGS', 'CPPFLAGS', 'LDFLAGS']:
         env_flags += filter(None, os.environ.get(var, '').split(' '))
 
@@ -28,7 +27,7 @@ def call_symbol_check(cc: List[str], source, executable, options):
     os.remove(executable)
     return (p.returncode, p.stdout.rstrip())
 
-def get_machine(cc: List[str]):
+def get_machine(cc: list[str]):
     p = subprocess.run([*cc,'-dumpmachine'], stdout=subprocess.PIPE, text=True)
     return p.stdout.rstrip()