thunderbird-bin: 115.4.2 -> 115.6.0
https://www.thunderbird.net/en-US/thunderbird/115.4.3/releasenotes/
https://www.thunderbird.net/en-US/thunderbird/115.5.0/releasenotes/
https://www.thunderbird.net/en-US/thunderbird/115.5.1/releasenotes/
https://www.thunderbird.net/en-US/thunderbird/115.5.2/releasenotes/
https://www.thunderbird.net/en-US/thunderbird/115.6.0/releasenotes/
(cherry picked from commit 99449cb0b8faaa8dee72a68c721a763695028d6a)