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

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https://hg.mozilla.org/integration/gaia-central/rev/2ad9978cd945
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #21373 from jrburke/bug1024856-email-link-view

Bug 1024856 - [email/UI] Change hyperlink handling to explicitly trigger view activity r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/032900b2b5f4
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1024856 - [email/UI] Change hyperlink handling to explicitly trigger view activity
Bumping manifests a=b2g-bump