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

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https://hg.mozilla.org/integration/gaia-1_4/rev/df264128da0d
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #19999 from AndreiH/bug_1020236

Bug 1020236

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https://hg.mozilla.org/integration/gaia-1_4/rev/9bc4824ab022
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 1020236 - [flame][v1.4] Disable test_settings_sim_manager.py
Bumping manifests a=b2g-bump