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

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https://hg.mozilla.org/integration/gaia-central/rev/a3e2bbd23c8d
Author: Jan Keromnes <janx@linux.com>
Desc: Merge pull request #18278 from jankeromnes/interruptible

Bug 995946 - Prevent transient breakage in the ReflowHelper due to a Developer HUD udpate. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/55fcdc15287e
Author: Jan Keromnes <janx@linux.com>
Desc: Bug 995946 - Prevent transient breakage in the ReflowHelper due to a Developer HUD udpate. r=etienne
Bumping manifests a=b2g-bump