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

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https://hg.mozilla.org/integration/gaia-central/rev/1c8ea883d521
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #26170 from gasolin/issue-973450-2

Bug 973450 - [settings] refactor Device information panel with AMD patte..., r=eragon

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https://hg.mozilla.org/integration/gaia-central/rev/ca9ff9cb7bdc
Author: gasolin <gasolin@gmail.com>
Desc: Bug 973450 - [settings] refactor Device information panel with AMD pattern
Bumping manifests a=b2g-bump