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

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https://hg.mozilla.org/integration/gaia-central/rev/9d11dd965aca
Author: Salvador de la Puente González <neo.salvador@gmail.com>
Desc: Merge pull request #24750 from lodr/bug-1043762-make-volume-works-while-ringtone-selection

Bug 1043762 - Volume buttons don't do anything in Settings and previewing new ringtones
r=:squib

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https://hg.mozilla.org/integration/gaia-central/rev/9b876d88da6d
Author: Salvador de la Puente <salva@unoyunodiez.com>
Desc: Bug 1043762 - Volume buttons don't do anything in Settings and previewing new ringtones
Bumping manifests a=b2g-bump