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

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https://hg.mozilla.org/integration/gaia-central/rev/9481caee0f96
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #21857 from crdlc/bug-1039968

Bug 1039968 - [B2G][OTA] The icon order within pages is not preserved wh...

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https://hg.mozilla.org/integration/gaia-central/rev/5647d7390c1b
Author: crdlc <crdlc@tid.es>
Desc: Bug 1039968 - [B2G][OTA] The icon order within pages is not preserved when there are collections
Bumping manifests a=b2g-bump