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

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https://hg.mozilla.org/integration/gaia-central/rev/b65a276cf3f2
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #16906 from crdlc/bug-970818

Bug 970818 - [Downloads Manager] Any message appears when the SD card is...

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https://hg.mozilla.org/integration/gaia-central/rev/e502b8a717e1
Author: crdlc <crdlc@tid.es>
Desc: Bug 970818 - [Downloads Manager] Any message appears when the SD card is full
Bumping manifests a=b2g-bump