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

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https://hg.mozilla.org/integration/gaia-central/rev/7525c54394f6
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #19133 from dmarcos/bug1008639

Bug 1008639 - [Camera] Add release notes to camera

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https://hg.mozilla.org/integration/gaia-central/rev/45e759250ba3
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 1008639 - [Camera] Add release notes to camera
Bumping manifests a=b2g-bump