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

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https://hg.mozilla.org/integration/gaia-central/rev/0ca5c5c2aca5
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #18927 from rnowm/1005802

Bug 1005802 - [Follow up] Create green themed header [BB] for comms apps r=german

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https://hg.mozilla.org/integration/gaia-central/rev/2970a14b4b3b
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 1005802 - [Follow up] Create green themed header [BB] for comms apps
Bumping manifests a=b2g-bump