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

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https://hg.mozilla.org/integration/gaia-central/rev/a452a38c1526
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Merge pull request #23684 from sergi/BUG_1062189

Bug 1062189 - Images in the contacts list are shifted to the right, overlapping letter shortcuts [r=francisco]

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https://hg.mozilla.org/integration/gaia-central/rev/88950f05b62f
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Bug 1062189 - Images in the contacts list are shifted to the right, overlapping letter shortcuts
Bumping manifests a=b2g-bump