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

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https://hg.mozilla.org/integration/gaia-central/rev/5dac5b9a59b4
Author: Carmen Jiménez <cjc@tid.es>
Desc: Merge pull request #14803 from mcjimenez/bug951552

Bug 951552 - Incorrect behavior when first boot is run with a pin locked SIM (and no PIN is entered)

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https://hg.mozilla.org/integration/gaia-central/rev/5898eab7c7b8
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 951552 - Incorrect behavior when first boot is run with a pin locked SIM (and no PIN is entered)

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https://hg.mozilla.org/integration/gaia-central/rev/8408e2616d93
Author: Borja Salguero <borjasalguero@users.noreply.github.com>
Desc: Merge pull request #14536 from borjasalguero/dm_demo_editmode

Bug 935100 - [Download Manager] Download list edit mode r=kaze, arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/91ea06f3c3b7
Author: borjasalguero <fbsc@tid.es>
Desc: Bug 935100 - [Download Manager] Download list edit mode r=kaze, arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/9db43d4417bd
Author: AndreiH <andrei.hutusoru@gmail.com>
Desc: Merge pull request #14830 from askeing/951985

Bug 951985 - Unxfail test_gallery_crop_photo.py and test_browser_play_yo...

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https://hg.mozilla.org/integration/gaia-central/rev/0ac7cc8c05fb
Author: askeing <askeing@gmail.com>
Desc: Bug 951985 - Unxfail test_gallery_crop_photo.py and test_browser_play_youtube_video.py