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

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https://hg.mozilla.org/integration/gaia-central/rev/81a88e840940
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #21115 from vingtetun/bug1022746

Bug 1022746 - The call log isn't using APZC anymore. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/b0181c24b32c
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1022746 - The call log isn't using APZC anymore. r=schung,rnowmrch
Bumping manifests a=b2g-bump