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

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https://hg.mozilla.org/integration/gaia-central/rev/792c8761977c
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25440 from fcampo/ftu-test-error

Fix FTU test

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https://hg.mozilla.org/integration/gaia-central/rev/5f5d76c25557
Author: Fernando Campo <fernando.campo@telefonica.com>
Desc: Bug 1077258 - Intermittent test failure - Fix FTU test

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https://hg.mozilla.org/integration/gaia-central/rev/62e42b1d4558
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25417 from gerv/bug-982044

Bug 982044 - update licensing information. r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/2d1c5c336c91
Author: Gervase Markham <gerv@gerv.net>
Desc: Bug 982044 - update licensing information.
Bumping manifests a=b2g-bump