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

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https://hg.mozilla.org/integration/gaia-2_0/rev/2cb7591ddf7c
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #21940 from dmarcos/bug1040864

Bug 1040864 - [Camera] Fix unit test after bad merge on bug 1024384 upli...

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https://hg.mozilla.org/integration/gaia-2_0/rev/2ff5acc39763
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 1040864 - [Camera] Fix unit test after bad merge on bug 1024384 uplift to v2.0
Bumping manifests a=b2g-bump