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

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https://hg.mozilla.org/integration/gaia-central/rev/52f1921ada2f
Author: Carmen Jiménez <cjc@tid.es>
Desc: Merge pull request #16223 from mcjimenez/bug923455

Bug 923455 - SV: Predictive text configurable by SIM

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https://hg.mozilla.org/integration/gaia-central/rev/693cc2ffa414
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 923455 - SV: Predictive text configurable by SIM
Bumping manifests a=b2g-bump