Bumping gaia.json for 3 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/473b5d791599
Author: Teodosia Pop <teodosia.pop@gmail.com>
Desc: Merge pull request #13454 from bobsilverberg/bug935440

Bug 935440 - Fix my mistake in test_geolocation_prompt.py

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https://hg.mozilla.org/integration/gaia-1_2/rev/753a6e2cd9bd
Author: Sergey Tupchiy <tupchii.sergii@gmail.com>
Desc: Bug 935440 - Fix my mistake in test_geolocation_prompt.py

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https://hg.mozilla.org/integration/gaia-1_2/rev/3b61f17d86d6
Author: Sergey Tupchiy <sergey.tupchiy@optile.de>
Desc: Bug 933709 - Write test for geolocation prompt