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

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https://hg.mozilla.org/integration/gaia-central/rev/89d027656c60
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #16609 from EverythingMe/bug-975917

Bug 975917 - [Everything.me] Tapping homebutton while in Collection Rena...

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https://hg.mozilla.org/integration/gaia-central/rev/851a7258826c
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 975917 - [Everything.me] Tapping homebutton while in Collection Rename mode may cause freeze [r=ranbena]
Bumping manifests a=b2g-bump