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

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https://hg.mozilla.org/integration/gaia-central/rev/50dfd8b9dafb
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #25566 from snowmantw/bug1086215

Bug 1086215 - [LockScreen] Resume the animation delay of Bug 1069879 aft...

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https://hg.mozilla.org/integration/gaia-central/rev/907502272224
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1086215 - [LockScreen] Resume the animation delay of Bug 1069879 after Bug 1079706 landed

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https://hg.mozilla.org/integration/gaia-central/rev/f7cdd151d662
Author: Evan Tseng <itoyxd@gmail.com>
Desc: Merge pull request #25535 from evanxd/bug-1089564

Bug 1089564 - Always keep latest time range in week view when come back from other screens r=millermedeiros

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https://hg.mozilla.org/integration/gaia-central/rev/cad4924a05d6
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 1089564 - Always keep latest time range in week view when come back from other screens
Bumping manifests a=b2g-bump