Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a3e4fc8a859d
Author: GaryChen, PYChen, Gary <mmm198219@gmail.com>
Desc: Merge pull request #23031 from mpizza/Bug_1039001_stop_timer_while_battery_status_on_low

Bug 1039001 - [B2G] [Camera] Unplugging device while taking a timed picture with low battery will not stop the picture being taken. r=dmarcos.

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https://hg.mozilla.org/integration/gaia-central/rev/a31010055813
Author: mpizza <mmm198219@gmail.com>
Desc: Bug 1039001 - [B2G] [Camera] Unplugging device while taking a timed picture with low battery will not stop the picture being taken.
Bumping manifests a=b2g-bump