Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues:

Security issues fixed:

- CVE-2019-11703: Fixed a heap-based buffer overflow in icalmemorystrdupanddequote() (bsc#1137595).
- CVE-2019-11704: Fixed a heap-based buffer overflow in parser_get_next_char() (bsc#1137595).
- CVE-2019-11705: Fixed a stack-based buffer overflow in icalrecur_add_bydayrules() (bsc#1137595).
- CVE-2019-11706: Fixed a type confusion in icaltimezone_get_vtimezone_properties() (bsc#1137595).
- CVE-2019-11707: Fixed a type confusion in Array.pop (bsc#1138872).
- CVE-2019-11708: Fixed a sandbox escape using Prompt:Open (bsc#1138872).

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#1137595
VUL-0: CVE-2019-11703,CVE-2019-11704,CVE-2019-11705,CVE-2019-11706: MozillaThunderbird: multiple vulnerabilities
bnc#1138872
EMU: VUL-0: CVE-2019-11708: MozillaFirefox,MozillaThunderbird: sandbox escape using Prompt:Open fixed in 67.0.4, 60.7.2 ESR (MFSA 2019-19 and MFSA 2019-20)
Selected Binaries
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