textproc/py-extract-msg: Update to 0.39.2

ChangeLog:
https://github.com/TeamMsgExtractor/msg-extractor/blob/v0.39.2/CHANGELOG.md

• Fixed issues with AttachmentBase.name that could cause it to generate wrong.
• Added convenience function MSGFile.exportBytes which returns the exported version from MSGFile.export as bytes instead of writing it to a file or file-like object.

PR: 269975