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

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https://hg.mozilla.org/integration/gaia-central/rev/086728d01d25
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #16272 from RickyChien/bug-972704

Update to latest verstion of test-agent r=@yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/014e7ceac9c6
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 972704 - Update to latest verstion of test-agent

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https://hg.mozilla.org/integration/gaia-central/rev/cddbf964c8c5
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #15897 from snowmantw/issue960901-instantiable-lockscreen

Bug 960901 - (lockscreen-instance) [LockScreen] Make LockScreen as an instantiable function

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https://hg.mozilla.org/integration/gaia-central/rev/231950eed309
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 960901 - (lockscreen-instance) [LockScreen] Make LockScreen as an instantiable function
Bumping manifests a=b2g-bump