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

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https://hg.mozilla.org/integration/gaia-central/rev/68b6903cea82
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #18211 from steveck-chung/bug-988772

Bug 988772 - Follow up for contact index shows nothing when tap on a index integration test. r=jmcanterafonseca

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https://hg.mozilla.org/integration/gaia-central/rev/036a3c3a6dda
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 988772 - Contacts shortcuts integration test refinement
Bumping manifests a=b2g-bump