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

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https://hg.mozilla.org/integration/gaia-central/rev/56c1d5b59eb4
Author: Sherman Chen <shamenchens@users.noreply.github.com>
Desc: Merge pull request #23130 from shamenchens/Bug1054234-SearchBlacklistApp-5

Bug 1054234 - Search app should not show blacklist apps, r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/27d2dbd59c97
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1054234 - Search app should not show blacklist apps
Bumping manifests a=b2g-bump