cups security and bug fix update

[1:2.2.6-38]

• 1775590 - rastertoepson filter crashes with paper size A6
  [1:2.2.6-37]
• forgot to enable optimization - 1833516
  [1:2.2.6-36]
• 1838449 - ipp/socket backends connect to turned off device for eternity (contimeout is not applied)
• 1689207 - Add failover backend
• 1833516 - DirtyCleanInterval ignored if there are open client connections
  [1:2.2.6-35]
• 1825254 - CVE-2020-3898 cups: heap based buffer overflow in libcupss ppdFindOption() in ppd-mark.c
  [1:2.2.6-34]
• 1809002 - scriptlet issue, /usr/bin/rm: cannot remove ‘/var/cache/cups/*.data’
  [1:2.2.6-34]
• 1784884 - cups.service doesnt execute automatically on request
  [1:2.2.6-34]
• 1822135 - _ppdOpen() leaks ‘string’ variable