Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/5be2775bf1b6
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #16011 from davidflanagan/bug942199v1.3

Bug 942199: Allow minimum EXIF preview size to be configured at build time for Camera and Gallery r=dmarcos

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https://hg.mozilla.org/integration/gaia-1_3/rev/f7a342827be4
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 942199: Allow minimum EXIF preview size to be configured at build time for Camera and Gallery