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

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https://hg.mozilla.org/integration/gaia-central/rev/d80e148e5277
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #15517 from snowmantw/issue951978

Bug 951978 - (secure-window) [Window Management] Implement Secure Window (for Secure Camera App on Lockscreen)

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https://hg.mozilla.org/integration/gaia-central/rev/beef1eb874aa
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 951978 - (secure-window) [Window Management] Implement Secure Window (for Secure Camera App on Lockscreen)

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https://hg.mozilla.org/integration/gaia-central/rev/28a0e5e982fd
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #15758 from EverythingMe/964661-sorting

Bug 964661 - [Everything.me] Collection Suggestions list is not sorted [r=ranbena]

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https://hg.mozilla.org/integration/gaia-central/rev/ca26dc92f307
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 964661 - [Everything.me] Collection Suggestions list is not sorted [r=ranbena]

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https://hg.mozilla.org/integration/gaia-central/rev/ec1fc9a04b87
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #15795 from crdlc/bug-965053

Bug 965053 - [B2G][Everything.me] Many apps do not show that they have a...

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https://hg.mozilla.org/integration/gaia-central/rev/0a20da6e64a4
Author: crdlc <crdlc@tid.es>
Desc: Bug 965053 - [B2G][Everything.me] Many apps do not show that they have already been added to the Homescreen
Bumping manifests a=b2g-bump