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

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https://hg.mozilla.org/integration/gaia-1_3/rev/c76f0163741a
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #21186 from frsela/STK/Bug1027521_v1.3

Bug 1027521 - [Sora]Phone returns to wrong screen when trying to return to previous screen in STK menu, r=jaoo

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https://hg.mozilla.org/integration/gaia-1_3/rev/c5e6ae5c0a21
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: Bug 1027521 - [Sora]Phone returns to wrong screen when trying to return to previous screen in STK menu
Bumping manifests a=b2g-bump