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

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https://hg.mozilla.org/integration/gaia-central/rev/6e25607a2319
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #22999 from arcturus/bug-1039189-2

Bug 1039189 - [User Story] Access connectivity settings when offline in search UI r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/12387365d460
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Bug 1039189 - [User Story] Access connectivity settings when offline in search UI r=kgrandon
Bumping manifests a=b2g-bump