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

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https://hg.mozilla.org/integration/gaia-central/rev/a5634dc872e5
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #24827 from Cwiiis/bug1078232-empty-group-name-hint

Bug 1078232 - Show empty group name edit hint text. r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/df6332c3f093
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1078232 - Show empty group name edit hint text. r=crdlc

When a group is empty, show hint text in edit mode that you can enter a
name.
Bumping manifests a=b2g-bump