Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-2_1/rev/586a1ba266b2
Author: Manuel Casas Barrado <manuel.casasbarrado@telefonica.com>
Desc: Bug 1054827 - [FTU][FTE] "Enter PIN code" for SIM2 page flashing and keypad not shown after flashing stops
Bumping manifests a=b2g-bump