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

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https://hg.mozilla.org/integration/gaia-central/rev/b3e3143ec127
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #26023 from janus926/bug-1096745

Bug 1096745 - Limit the scope of lockscreen CSS to eliminate unnecessary...

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https://hg.mozilla.org/integration/gaia-central/rev/138b6acffd56
Author: Ting-Yu Chou <janus926@gmail.com>
Desc: Bug 1096745 - Limit the scope of lockscreen CSS to eliminate unnecessary restyle. r=gweng
Bumping manifests a=b2g-bump