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

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https://hg.mozilla.org/integration/gaia-central/rev/7b52bf615a7e
Author: Marina <marina.rodrigueziglesias@telefonica.com>
Desc: Merge pull request #25878 from gitmai/bug-1094753-fix-onhashchanged-method

Bug 1094753 - [Costcontrol] Changing the hash value for '#' does not mai...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/9b60c395cfe4
Author: mai <mri@tid.es>
Desc: Bug 1094753 - [Costcontrol] Changing the hash value for '#' does not maintain the correct hash on the app.
Bumping manifests a=b2g-bump