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

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https://hg.mozilla.org/integration/gaia-central/rev/53371cc0e179
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #26405 from mancas/bug1100608

Bug 1100608 - [Dual SIM] With 2 locked SIMs, cannot enter pin of second ...r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/6524f4d40577
Author: Manuel <manuel.casasbarrado@telefonica.com>
Desc: Bug 1100608 - [Dual SIM] With 2 locked SIMs, cannot enter pin of second SIM unless the first is entered
Bumping manifests a=b2g-bump