Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/b013f88a175b
Author: Borja Salguero <borjasalguero@users.noreply.github.com>
Desc: Merge pull request #13680 from EragonJ/v1.2-bug-934690

Bug 934690 - [B2G][FTU] Final screen of FTU does not have image r=borjasalguero

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https://hg.mozilla.org/integration/gaia-1_2/rev/0eaaf0f1e90e
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 934690 - [B2G][FTU] Final screen of FTU does not have image

- this is a v1.2 branch fix
- update steps because depended bug 916262 is not uplifted to v1.2