fix youtube cookie consent check (#238)

before this fix, python 3.11 would fail like this:
AttributeError: 'str' object has no attribute 'value'

assuming that socs.value is the correct way to retrieve the value in
some versions of python, avoid the issue by casting to string

Author: 9001

chat_downloader/sites/youtube.py

@@ -1366,7 +1366,7 @@ def _initialize_consent(self):
         if self.get_cookie_value('__Secure-3PSID'):
             return
         socs = self.get_cookie_value('SOCS')
-        if socs and not socs.value.startswith('CAA'):  # not consented
+        if socs and not str(socs).startswith('CAA'):  # not consented
             return
         self.set_cookie_value('.youtube.com', 'SOCS', 'CAI', secure=True)  # accept all (required for mixes)