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

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https://hg.mozilla.org/integration/gaia-central/rev/75fc326793d1
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #13056 from frsela/STK/Bug928581

Bug 928581 - STK: Tone plays forever when missing alphaId, r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/7058492c407d
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: Bug 928581 - STK: Tone plays forever when missing alphaId