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

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https://hg.mozilla.org/integration/gaia-central/rev/6a306f592d98
Author: chirarobert <robert.chira@softvision.ro>
Desc: Merge pull request #26530 from viorelaioia/bug_1102931

Bug 1102931 - Intermittent test_ftu_with_tour.py TestFtu.test_ftu_with_t...

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https://hg.mozilla.org/integration/gaia-central/rev/ddfd28c9ecc5
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1102931 - Intermittent test_ftu_with_tour.py TestFtu.test_ftu_with_tour
Bumping manifests a=b2g-bump