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

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https://hg.mozilla.org/integration/gaia-central/rev/0953d2847880
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #25875 from steveck-chung/message-duplicate-drafts

Bug 1079824 - [Messages] Draft saved from activity is duplicated, r=azasypkin

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https://hg.mozilla.org/integration/gaia-central/rev/b8ca61908fae
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 1079824 - [Messages] Draft saved from activity is duplicated, r=azasypkin
Bumping manifests a=b2g-bump