Log Message:
thunderbird: Update to 78.7.1

Changelog:
What's New
CardDAV address books now support OAuth2 and Google Contacts.

Changes
Thunderbird will no longer allow installation of addons that use the legacy API

Fixes
Send message button sometimes remained enabled when it should be disabled
Pressing command+enter to send a message on macOS did not work
OpenPGP: Failed to save attachments that contained binary data after decryption
Global search UI fixes
Various theme and color fixes to improve ease of use