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

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https://hg.mozilla.org/integration/gaia-central/rev/75b2e19e613b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20456 from KevinGrandon/bug_1023817_vertical_font_sizing

Bug 1023817 - [vertical] Several app names are truncated because of font-size

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https://hg.mozilla.org/integration/gaia-central/rev/9bb45e745358
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1023817 - [vertical] Several app names are truncated because of font-size r=me f=flod
Bumping manifests a=b2g-bump