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

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https://hg.mozilla.org/integration/gaia-central/rev/744ef12d9760
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #20878 from crdlc/bug-1028685

Bug 1028685 - [Collection app] Edit header obscured

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https://hg.mozilla.org/integration/gaia-central/rev/f12b5fc7a103
Author: crdlc <crdlc@tid.es>
Desc: Bug 1028685 - [Collection app] Edit header obscured
Bumping manifests a=b2g-bump