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

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https://hg.mozilla.org/integration/gaia-central/rev/acbac4f5cfd2
Author: Marina <marina.rodrigueziglesias@telefonica.com>
Desc: Merge pull request #26361 from gitmai/bug-1102818-starting-on-field-init

Bug 1102818 - 'Starting on' field has to be initialized with the current...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/5d35f2254f4f
Author: mai <mri@tid.es>
Desc: Bug 1102818 - 'Starting on' field has to be initialized with the current date
Bumping manifests a=b2g-bump