[issue31715] Add mimetype for extension .mjs

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

It's technically a new feature. New features are not added to existing releases unless there is a very compelling reason.

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nosy: +christian.heimes

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31715>
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