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

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https://hg.mozilla.org/integration/gaia-central/rev/2e3b257acf16
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #21842 from dmarcos/bug1037638

Bug 1037638 - Restrict to 3MP images (CONFIG_MAX_IMAGE_PIXEL_SIZE) only ...

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https://hg.mozilla.org/integration/gaia-central/rev/f653ce6f6195
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 1037638 - Restrict to 3MP images (CONFIG_MAX_IMAGE_PIXEL_SIZE) only for low-memory devices
Bumping manifests a=b2g-bump