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

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https://hg.mozilla.org/integration/gaia-central/rev/6f7c16a1f9c5
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #25201 from mikehenrty/bug-1082071-unlock-trigger-resize

Bug 1082071 - Make unlocking screen trigger system resize when SHB enabl...

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https://hg.mozilla.org/integration/gaia-central/rev/a9bc337e9c31
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1082071 - Make unlocking screen trigger system resize when SHB enabled
Bumping manifests a=b2g-bump