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

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https://hg.mozilla.org/integration/gaia-central/rev/c23b496987e1
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #17354 from gasolin/issue-973448-2

Bug 973448 - [settings] refactor Support panel with AMD pattern, r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/f5624be4f1a2
Author: gasolin <gasolin@gmail.com>
Desc: Bug 973448 - [settings] refactor Support panel with AMD pattern
Bumping manifests a=b2g-bump