Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_2/rev/68ecaab1275e
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1149116 - Avoid triggering overlayopening when tapping

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https://hg.mozilla.org/integration/gaia-2_2/rev/f4da963ebbcd
Author: albertopq <albert.pastor@gmail.com>
Desc: Bug 1144591 - Moving the SHB when switching orentiation in a secure app

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https://hg.mozilla.org/integration/gaia-2_2/rev/d427bbf1e009
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1148003 - Moving system dialogs under lockscreen r=mhenretty

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https://hg.mozilla.org/integration/gaia-2_2/rev/3e51a0928f3e
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1069353 - Listen for screenreader click events in lockscreen slider module.

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https://hg.mozilla.org/integration/gaia-2_2/rev/683168b9f2b0
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 1146687 - [Dialer] Localize withheld number string to bdi element, r=gsvelto