Add new video MIME types and update contributions

Added new MIME types for various video file extensions and updated contribution references.

Author: clin1234

Doc/whatsnew/3.15.rst

@@ -867,8 +867,17 @@ mimetypes
   - ``application/vnd.ms-cab-compressed`` for ``.cab`` extension
   - ``application/vnd.ms-htmlhelp`` for ``.chm`` extension
   - ``application/vnd.ms-officetheme`` for ``.thmx`` extension
-
-  (Contributed by Charlie Lin in :gh:`145718`.)
+  - ``.3gp``   for ``video/3gpp``
+  - ``.3g2``   for ``video/3gpp2``
+  - ``.m4s``   for ``video/iso.segment``
+  - ``.lot``   for ``video/lottie+json``
+  - ``.mj2``   for ``video/mj2``
+  - ``.pyv``   for ``video/vnd.ms-playready.media.pyv``
+  - ``.blk`` and ``.bk2`` for ``video/vnd.radgamettools.bink``
+  - ``.sswf`` and ``.ssw`` for ``video/vnd.sealed.swf``
+  - ``.yt``    for ``video/vnd.youtube.yt``
+
+  (Contributed by Charlie Lin in :gh:`145718` and :gh:`146342`.)
 
 * Add ``image/jxl``. (Contributed by Foolbar in :gh:`144213`.)
 * Rename ``application/x-texinfo`` to ``application/texinfo``.