Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/25a5d3c030a5
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #24802 from lightsofapollo/bug-1076689-chunk

Bug 1076689 - chunk build tests on taskcluster r=@RickyChien

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https://hg.mozilla.org/integration/gaia-central/rev/190b90c0b46a
Author: James Lal <james@lightsofapollo.com>
Desc: Bug 1076689 - Split up build integration tests + add chunking for TC to GBI.

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https://hg.mozilla.org/integration/gaia-central/rev/b9aee32e107a
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #24720 from dmarcos/bug1055270

[Bug 1055270] [KK Only][Flame][Camera] Face detection coordinates are in...

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https://hg.mozilla.org/integration/gaia-central/rev/974f6cfc8cfb
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: [Bug 1055270] [KK Only][Flame][Camera] Face detection coordinates are inverted
Bumping manifests a=b2g-bump