Update to ytdl-commit-6508688

Make default upload_/release_date a compat_str
https://github.com/ytdl-org/youtube-dl/commit/6508688e88c83bb811653083db9351702cd39a6a

Except:
* "[NDR] Overhaul NDR and NJoy extractors" https://github.com/ytdl-org/youtube-dl/pull/30531
    - https://github.com/ytdl-org/youtube-dl/commit/01824d275bfa7efbaca274b38c1ddc2b03f12f5d
    - https://github.com/ytdl-org/youtube-dl/commit/39a98b09a2acf50dc64bc41185be723b98e740b9
    - https://github.com/ytdl-org/youtube-dl/commit/f0a05a55c2ee512880546c056cfbec5ad3399798
    - https://github.com/ytdl-org/youtube-dl/commit/4186e817772d49d6f66b07c5ac8c248f026a6446

yt_dlp/extractor/rutv.py

@@ -6,7 +6,8 @@ import re
 from .common import InfoExtractor
 from ..utils import (
     ExtractorError,
-    int_or_none
+    int_or_none,
+    str_to_int
 )
 
 
@@ -179,7 +180,7 @@ class RUTVIE(InfoExtractor):
                         'player_url': 'http://player.rutv.ru/flash3v/osmf.swf?i=22',
                         'rtmp_live': True,
                         'ext': 'flv',
-                        'vbr': int(quality),
+                        'vbr': str_to_int(quality),
                         'quality': preference,
                     }
                 elif transport == 'm3u8':