Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/0d77cb12e265
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #15970 from AndreiH/bug968083

Bug 968083 - Intermittent fail in test_import_contacts_from_sim

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https://hg.mozilla.org/integration/gaia-central/rev/2a32da7a0e1c
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 968083 - Intermittent fail in test_import_contacts_from_sim

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https://hg.mozilla.org/integration/gaia-central/rev/e4639fad0e86
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 970458 - Disable failing clock tests on TBPL/Gu a=testonly r=me
Bumping manifests a=b2g-bump