[instagram] Add referrer to prevent throttling (#676)

Code from: https://github.com/ytdl-org/youtube-dl/pull/29751
Fixes: https://github.com/ytdl-org/youtube-dl/issues/29736

Authored by: u-spec-png, kikuyan

yt_dlp/extractor/instagram.py

@@ -277,6 +277,9 @@ class InstagramIE(InfoExtractor):
             'like_count': like_count,
             'comment_count': comment_count,
             'comments': comments,
+            'http_headers': {
+                'Referer': 'https://www.instagram.com/',
+            }
         }