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

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https://hg.mozilla.org/integration/gaia-central/rev/a7b5528bad7d
Author: Fernando Campo <fcampo@users.noreply.github.com>
Desc: Merge pull request #26025 from fcampo/fte-better-wifi-scan

Bug 1067677 - Make wifi scanning in FTU more reliable and quicker (r=fcampo)

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https://hg.mozilla.org/integration/gaia-central/rev/bd067ca3a1a5
Author: Fernando Campo <fernando.campo@telefonica.com>
Desc: Bug 1067677 - Make wifi scanning in FTU more reliable and quicker (r=fcampo)

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Code submitted by Giovanni Charles
Rebased after by Fernando Campo
(see bug's comments for explanation)
Bumping manifests a=b2g-bump