Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_4/rev/bf2d5bd76220
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18274 from snowmantw/issue992345-v1.4

Bug 992345 - [B2G][Lockscreen] Lockscreen appears horizontal instead of vertical on landscape

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https://hg.mozilla.org/integration/gaia-1_4/rev/7bd3ba6d6775
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 992345 - [B2G][Lockscreen] Lockscreen appears horizontal instead of vertical on landscape
Bumping manifests a=b2g-bump