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

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https://hg.mozilla.org/integration/gaia-central/rev/890550ceed75
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: Merge pull request #14252 from EverythingMe/944026-installed-size-shadow

[Bug 944026] Fix icon size and shadow [r=amirn]

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https://hg.mozilla.org/integration/gaia-central/rev/ed72f6607e67
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: [Bug 944026] Fix icon size and shadow [r=amirn]