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

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https://hg.mozilla.org/integration/gaia-central/rev/ee29f9e64b72
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: Merge pull request #12544 from EverythingMe/collection-pagination

[Bug 921994] hide pagination bar when a collection is open [r=crdlc]

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https://hg.mozilla.org/integration/gaia-central/rev/44cff47384c3
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: [Bug 921994] hide pagination bar when a collection is open [r=crdlc]