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

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https://hg.mozilla.org/integration/gaia-central/rev/43966bdab1ac
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #17511 from cctuan/973446

Bug 973446 - [settings] refactor B2G improve and feedback panel with AMD...

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https://hg.mozilla.org/integration/gaia-central/rev/3e58ae5e1147
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 973446 - [settings] refactor B2G improve and feedback panel with AMD pattern
Bumping manifests a=b2g-bump