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

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https://hg.mozilla.org/integration/gaia-2_0/rev/5249082df31a
Author: viorelaioia <viorelaioia@gmail.com>
Desc: Merge pull request #22733 from chirarobert/unxfail_contacts_prompt

Bug 1021732 - [Flame] Re-enable test_privileged_app_contacts_prompt

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https://hg.mozilla.org/integration/gaia-2_0/rev/48eca6ce0c53
Author: Robert Chira <robertchira@P5075.(none)>
Desc: Bug 1021732 - [Flame] Re-enable test_privileged_app_contacts_prompt
Bumping manifests a=b2g-bump