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

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https://hg.mozilla.org/integration/gaia-central/rev/6b95b9c7c879
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #24170 from crdlc/bug-1069231

Bug 1069231 - Contacts Management > Set ICE Contacts is active when the ...

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https://hg.mozilla.org/integration/gaia-central/rev/378159836f13
Author: crdlc <crdlc@tid.es>
Desc: Bug 1069231 - Contacts Management > Set ICE Contacts is active when the list of contacts is empty
Bumping manifests a=b2g-bump