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

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https://hg.mozilla.org/integration/gaia-central/rev/025311e0fffc
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #16175 from bebef1987/sleep_menu

Bug 968751 - Write a test to open long-press power button menu

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https://hg.mozilla.org/integration/gaia-central/rev/29eb97bf015a
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 968751 - Write a test to open long-press power button menu
Bumping manifests a=b2g-bump