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

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https://hg.mozilla.org/integration/gaia-2_0/rev/6b99d558761f
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #22253 from viorelaioia/bug_1044019_v2.0

Bug 1044019 - Add /storage/sdcard to cleanup_storage in gaia test

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https://hg.mozilla.org/integration/gaia-2_0/rev/d55ac36ec988
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1044019 - Add /storage/sdcard to cleanup_storage in gaia test
Bumping manifests a=b2g-bump