Replace deprecated distutils package

The package `distutils` is deprecated since python 3.10
and it is scheduled to be removed with python 3.12, see:
https://docs.python.org/3.12/whatsnew/3.12.html
python/cpython#92584

`shutil.copytree()` is able to copy the source directory tree to an existing
destination directory only from python 3.8 (parameter `dirs_exist_ok=True`),
for python < 3.8 still use `distutils.dir_util.copy_tree()`

Author: ppigazzini

worker/sri.txt

@@ -1 +1 @@
-{"__version": 213, "updater.py": "GEDqwD5F16roa/hRFbTNbbUqW/smvbe/4Rcf09O5BIJOAI63wsAVgLEnMtQp1naZ", "worker.py": "dT4tz1DqISrMUZhqlQNV94nvpf6EPVg0ebs118cSJ8gC7C22PetaQjQgA1Ciupm4", "games.py": "LyUiwCAMXllQWLIHsWGZpQpziYGO6dK3jDXzimEFd2ehLLrp5nsSGbl7+AUQTnAa"}
+{"__version": 213, "updater.py": "jkqHSdrm3XNEDF2Xck73ZgH3zx6fauZuYlkvYRj1kTaO+qzB/DLQvXy3NTQ0AkRt", "worker.py": "dT4tz1DqISrMUZhqlQNV94nvpf6EPVg0ebs118cSJ8gC7C22PetaQjQgA1Ciupm4", "games.py": "LyUiwCAMXllQWLIHsWGZpQpziYGO6dK3jDXzimEFd2ehLLrp5nsSGbl7+AUQTnAa"}

worker/updater.py

@@ -2,7 +2,6 @@
 import shutil
 import sys
 from datetime import datetime, timezone
-from distutils.dir_util import copy_tree
 from pathlib import Path
 from zipfile import ZipFile
 
@@ -57,7 +56,14 @@ def update(restart=True, test=False):
                     sep="",
                     file=sys.stderr,
                 )
-        copy_tree(str(worker_src), str(worker_dir))
+        if sys.version_info >= (3, 8):
+            from shutil import copytree
+
+            copytree(worker_src, worker_dir, dirs_exist_ok=True)
+        else:
+            from distutils.dir_util import copy_tree
+
+            copy_tree(str(worker_src), str(worker_dir))
     else:
         file_list = os.listdir(worker_src)
     shutil.rmtree(update_dir)