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

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https://hg.mozilla.org/integration/gaia-central/rev/2a0c0531f4c6
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #13383 from rnowm/934458

Bug 934458 - [Messaging] 'Messaging options' label does not appear completely

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https://hg.mozilla.org/integration/gaia-central/rev/5bae6440820d
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 934458 - [Messaging] 'Messaging options' label does not appear completely