[core] Fix support for upcoming Python 3.12 (#8130)

This also adds the following test runners:
- `3.12-dev` on `ubuntu-latest`
- `3.12-dev` on `windows-latest`
- `pypy-3.10` on `ubuntu-latest`

Authored by: Grub4K

yt_dlp/extractor/aws.py

@@ -12,7 +12,7 @@ class AWSIE(InfoExtractor):  # XXX: Conventionally, base classes should end with
 
     def _aws_execute_api(self, aws_dict, video_id, query=None):
         query = query or {}
-        amz_date = datetime.datetime.utcnow().strftime('%Y%m%dT%H%M%SZ')
+        amz_date = datetime.datetime.now(datetime.timezone.utc).strftime('%Y%m%dT%H%M%SZ')
         date = amz_date[:8]
         headers = {
             'Accept': 'application/json',