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

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https://hg.mozilla.org/integration/gaia-1_4/rev/78932969ec34
Author: Min-Zhong "John" Lu <mnjul@users.noreply.github.com>
Desc: Merge pull request #20058 from mnjul/bug_1011645_lockscreen_passcode_camera_button_stall_v1.4

Bug 1011645 - [B2G][Lockscreen] When unlocking a phone with a passcode, the user will see a blank homescreen with no apps - v1.4

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https://hg.mozilla.org/integration/gaia-1_4/rev/3dda0f7909b4
Author: John Lu [:mnjul] <jlu@mozilla.com>
Desc: Bug 1011645 - [B2G][Lockscreen] When unlocking a phone with a passcode, the user will see a blank homescreen with no apps
Bumping manifests a=b2g-bump