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

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https://hg.mozilla.org/integration/gaia-central/rev/64ad292a5edf
Author: punamdahiya <punamdahiya@yahoo.com>
Desc: Merge pull request #24495 from punamdahiya/Bug-1073688

Bug1073688 - [Gallery] - Handle pick activity when user selects a photo,  crop, then mounts USB and deletes photo r=russn

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https://hg.mozilla.org/integration/gaia-central/rev/fd245da333e3
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug1073688 - [Gallery] - Handle pick activity when user selects a photo, crop, then mounts USB and deletes photo r=russn
Bumping manifests a=b2g-bump