Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6da383fbff50
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #22150 from viorelaioia/bug_1043442

Bug 1043442 - Improve wait in wait_for_capture_ready()

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https://hg.mozilla.org/integration/gaia-central/rev/82d44abe0caa
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1043442 - Improve wait in wait_for_capture_ready()

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https://hg.mozilla.org/integration/gaia-central/rev/998eeda82a2e
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #22162 from viorelaioia/bug_1043471

Bug 1043471 - Investigate failure in test_import_contacts_from_sdcard.py

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https://hg.mozilla.org/integration/gaia-central/rev/19159387f8d2
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1043471 - Investigate failure in test_import_contacts_from_sdcard.py
Bumping manifests a=b2g-bump