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

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https://hg.mozilla.org/integration/gaia-1_3/rev/a8ee9a584ba1
Author: Fernando Rodríguez Sela <frsela@tid.es>
Desc: Merge pull request #20985 from frsela/STK/Bug1026377_v1.3

Bug 1026377 - [Sora]There is no highlight stripe when selecting some option in STK menu, r=jaoo

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https://hg.mozilla.org/integration/gaia-1_3/rev/eaa59e1c6589
Author: Fernando Rodriguez Sela <frsela@tid.es>
Desc: Bug 1026377 - [Sora]There is no highlight stripe when selecting some option in STK menu
Bumping manifests a=b2g-bump
Bug 1027268 - Remove unnecessary timeout from test_bug391747.html to fix intermittent failures. r=mats, a=test-only
Merge b2g28 to v1.3t. a=merge