Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues: Updated to version 91.7 (bsc#1196900): - CVE-2022-26381: Fixed an invalid memory access due to text reflow when SVG objects were present. - CVE-2022-26383: Fixed an issue where, when resizing a popup after requesting fullscreen access, the popup would not display the fullscreen notification. - CVE-2022-26384: Fixed an iframe XSS sandbox bypass when allow-popups was used on the iframe. - CVE-2022-26386: Fixed an issue where downloadable temporary files were accessible to other local users. - CVE-2022-26387: Fixed a potential add-on signature verification bypass due to a race condition.