Add MIME types for video/3gpp and video/3gpp2

Feature or enhancement

Proposal:

the audio versions of these containers are already supported

https://github.com/python/cpython/blob/4b63cd170e5dd840bffc80922f09f2d69932ff5c/Lib/mimetypes.py#L527-L530

the video versions should be too. They are already registered with IANA here: https://www.iana.org/assignments/media-types/media-types.xhtml

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

Issue where those audio/ mimetypes were added https://github.com/python/cpython/issues/87160

Linked PRs

• gh-122632

Lib/mimetypes.py の参照されている 527-530 行から始めます。そこではオーディオコンテナの MIME タイプが登録されています。対応するビデオタイプを追加し、video/3gpp と video/3gpp2 の両方が認識されることを確認します。その際、既存の issue 87160 の変更をコンテキストとして使用してください。