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

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https://hg.mozilla.org/integration/gaia-central/rev/f0337a6e4acb
Author: Borja Salguero <borjasalguero@users.noreply.github.com>
Desc: Merge pull request #15356 from borjasalguero/dm_update_time_strings

Bug 941655 - [Download Manager] Update time strings within download list...

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https://hg.mozilla.org/integration/gaia-central/rev/d0e6c2430aa8
Author: borjasalguero <fbsc@tid.es>
Desc: Bug 941655 - [Download Manager] Update time strings within download list r=kaze, arcturus
Bumping manifests a=b2g-bump