Updated thunderbird packages fix security vulnerabilities

Updated thunderbird packages fix security vulnerabilities: When deriving an identifier for an email message, uninitialized memory was used in addition to the message contents (CVE-2020-6792). When processing an email message with an ill-formed envelope, Thunderbird could read data from a random memory location (CVE-2020-6793). If a user saved passwords before Thunderbird 60 and then later set a master password, an unencrypted copy of these passwords is still accessible. This is because the older stored password file was not deleted when the data was copied to a new format starting in Thunderbird 60. The new master password is added only on the new file. This could allow the exposure of stored password data outside of user expectations (CVE-2020-6794). When processing a message that contains multiple S/MIME signatures, a bug in the MIME processing code caused a null pointer dereference, leading to an unexploitable crash (CVE-2020-6795). If a tag was used in a tag, the parser could be confused and allow JavaScript parsing and execution when it should not be allowed. A site that relied on the browser behaving correctly could suffer a cross-site scripting vulnerability as a result (CVE-2020-6798). Memory safety bugs present in Thunderbird ESR 68.4. Some of these bugs showed evidence of memory corruption and presumably some of these could have been exploited to run arbitrary code (CVE-2020-6800).