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

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https://hg.mozilla.org/integration/gaia-central/rev/c9d200d52584
Author: viorelaioia <viorelaioia@gmail.com>
Desc: Merge pull request #22173 from bebef1987/clean

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

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https://hg.mozilla.org/integration/gaia-central/rev/51060ed4e1c3
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 1044019 - Add /storage/sdcard to cleanup_storage in gaia test
Bumping manifests a=b2g-bump