Document changes and release 1:91.4.1-1

debian/changelog

+thunderbird (1:91.4.1-1) unstable; urgency=medium
+
+  * [c5b36d3] New upstream version 91.4.1
+    Fixed CVE issues in upstream version 91.4.1 (MFSA 2021-55):
+    CVE-2021-4126: OpenPGP signature status doesn't consider additional
+                   message content
+    CVE-2021-44538: Matrix chat library libolm bundled with Thunderbird
+                    vulnerable to a buffer overflow
+  * [b66bebb] d/changelog: Update some MOZ-* entries with assigned CVEs
+
+ -- Carsten Schoenert <c.schoenert@t-online.de>  Mon, 20 Dec 2021 16:05:02 +0100
+
 thunderbird (1:91.4.0-1) unstable; urgency=medium
 
   * [7752be0] d/source.filter: Small updates to filtering list