Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/bac0d2577cf0
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #22923 from zacc/bug_1049489_contacts_api

Bug 1049489 - gaiatest: execute all ContactsAPI calls in chrome context

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https://hg.mozilla.org/integration/gaia-central/rev/611b2073d924
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1049489 - gaiatest: execute all ContactsAPI calls in chrome context

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https://hg.mozilla.org/integration/gaia-central/rev/3df222b83197
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #23069 from RudyLu/keyboard/Bug1055972-disable_keyboard_uninstallation_test

Bug 1055972 - disable keyboard uninstallation test.
r=test-only

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https://hg.mozilla.org/integration/gaia-central/rev/7317e2fd901c
Author: Rudy Lu <me@rudy.lu>
Desc:  Bug 1055972 - disable keyboard uninstallation test.
  - apps/keyboard/test/marionette/uninstallation_test.js

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https://hg.mozilla.org/integration/gaia-central/rev/5f63abfdea18
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #22195 from zacc/bug_1044484

Bug 1044484 - Re-jig the gaia-ui-tests manifests to obsolete tbpl-manife...

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https://hg.mozilla.org/integration/gaia-central/rev/5af1c31c2088
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1044484 - Add an external tag to gaiatest manifests to denote tests use of external internet resources
Bumping manifests a=b2g-bump