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

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https://hg.mozilla.org/integration/gaia-central/rev/27dd52b7c2d1
Author: Min-Zhong "John" Lu <jlu@mozilla.com>
Desc: Merge pull request #23697 from mnjul/bug_1062695_lckscr_wrong_more_noti_arrow

Bug 1062695 - Set min-height for lockscreen notifications container to prevent "more notifications" arrow from showing when it shouldn't. r=gweng

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https://hg.mozilla.org/integration/gaia-central/rev/9495ccf3d1c3
Author: John Lu [:mnjul] <jlu@mozilla.com>
Desc: Bug 1062695 - Set min-height for lockscreen notifications container to prevent "more notifications" arrow from showing when it shouldn't

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https://hg.mozilla.org/integration/gaia-central/rev/498401fcd9cc
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #23574 from crdlc/bug-1053758

Bug 1053758 - Update "add to home screen" dialog to meet new interaction...

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https://hg.mozilla.org/integration/gaia-central/rev/a1d0c4528337
Author: crdlc <crdlc@tid.es>
Desc: Bug 1053758 - Update "add to home screen" dialog to meet new interaction and UX specs
Bumping manifests a=b2g-bump