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

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https://hg.mozilla.org/integration/gaia-central/rev/152c7345a86d
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #20647 from EragonJ/bug-1020867

Bug 1020867 - Don't allow user to turn on wifi hotspot when airplane mod...

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https://hg.mozilla.org/integration/gaia-central/rev/d75f2cf0b235
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1020867 - Don't allow user to turn on wifi hotspot when airplane mode is enabled
Bumping manifests a=b2g-bump