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

========

https://hg.mozilla.org/integration/gaia-central/rev/775b4f17372f
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #24160 from crdlc/bug-1068826

Bug 1068826 - [Flame][KK]Upon booting for first time, there are extra pr...

========

https://hg.mozilla.org/integration/gaia-central/rev/0a02c24e21ab
Author: crdlc <crdlc@tid.es>
Desc: Bug 1068826 - [Flame][KK]Upon booting for first time, there are extra processes in the memory, possbly slowing the performance

========

https://hg.mozilla.org/integration/gaia-central/rev/807dd5190e81
Author: Min-Zhong "John" Lu <jlu@mozilla.com>
Desc: Merge pull request #23757 from mnjul/bug_1058447_lckscr_noti_bg_at_boot

Bug 1058447 - [LockScreen] Generate notifications color overlay eagerly when we update background image, if screen is on and locked. r=gweng

========

https://hg.mozilla.org/integration/gaia-central/rev/ecebe8925659
Author: John Lu [:mnjul] <jlu@mozilla.com>
Desc: Bug 1058447 - [LockScreen] Generate notifications color overlay eagerly when we update background image, if screen is on and locked

Also added tests that got obliterated in bug 1023329.
Bumping manifests a=b2g-bump