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

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https://hg.mozilla.org/integration/gaia-central/rev/b1b2b894f667
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #24895 from justindarc/bug1078654

Bug 1078654 - [Usage][Cost Control] In Usage app - Hide Apps from Mobile...

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https://hg.mozilla.org/integration/gaia-central/rev/1062f7349f0d
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1078654 - [Usage][Cost Control] In Usage app - Hide Apps from Mobile Data Usage list if they use 0 data
Bumping manifests a=b2g-bump