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

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https://hg.mozilla.org/integration/gaia-central/rev/758bbdda6bb7
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23128 from KevinGrandon/bug_1056469_rocketbar_use_template_literals

Bug 1056469 - [Rocketbar] Use template literals for app chrome

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https://hg.mozilla.org/integration/gaia-central/rev/0cf4ee6bc207
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1056469 - [Rocketbar] Use template literals for app chrome r=kgrandon
Bumping manifests a=b2g-bump