- Mozilla Thunderbird 91.3.0
  * several fixes as outlined here
    https://www.thunderbird.net/en-US/thunderbird/91.3.0/releasenotes/
  MFSA 2021-50  (bsc#1192250)
  * CVE-2021-38503 (bmo#1729517)
    iframe sandbox rules did not apply to XSLT stylesheets
  * CVE-2021-38504 (bmo#1730156)
    Use-after-free in file picker dialog
  * CVE-2021-38505 (bmo#1730194)
    Windows 10 Cloud Clipboard may have recorded sensitive user data
  * CVE-2021-38506 (bmo#1730750)
    Thunderbird could be coaxed into going into fullscreen mode
    without notification or warning
  * CVE-2021-38507 (bmo#1730935)
    Opportunistic Encryption in HTTP2 could be used to bypass the
    Same-Origin-Policy on services hosted on other ports
  * MOZ-2021-0008 (bmo#1667102)
    Use-after-free in HTTP2 Session object
  * CVE-2021-38508 (bmo#1366818)
    Permission Prompt could be overlaid, resulting in user
    confusion and potential spoofing
  * CVE-2021-38509 (bmo#1718571)
    Javascript alert box could have been spoofed onto an
    arbitrary domain
  * CVE-2021-38510 (bmo#1731779)
    Download Protections were bypassed by .inetloc files on Mac OS
  * MOZ-2021-0007 (bmo#1606864, bmo#1712671, bmo#1730048,
    bmo#1735152)
    Memory safety bugs fixed in Thunderbird ESR 91.3
- Drop unused pkgconfig(gdk-x11-2.0) BuildRequires

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