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

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https://hg.mozilla.org/integration/gaia-central/rev/b75b7888c3ad
Author: EragonJ (E.J.) <eragonj@eragonj.me>
Desc: Merge pull request #26514 from EragonJ/bug-1103815

Bug 1103815 - [Settings][Dialog] internet_sharing/hotspot_settings shoul...

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https://hg.mozilla.org/integration/gaia-central/rev/2ea76bde937b
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1103815 - [Settings][Dialog] internet_sharing/hotspot_settings should be shown as a dialog
Bumping manifests a=b2g-bump