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

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https://hg.mozilla.org/integration/gaia-1_4/rev/342514161ba8
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #19604 from jrburke/bug1012896-v1.4-email-icons-cutoff

Bug 1012896 (v1.4) [B2G][Open_C][E-mail]The Reply, Reply All, and Forward icons are cut off r=mcav a=1.4+

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https://hg.mozilla.org/integration/gaia-1_4/rev/cd06146563d2
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1012896 - [B2G][Open_C][E-mail]The Reply, Reply All, and Forward icons are cut off
1.4 merge of f05657e032bc851bccd374251509746b212f4869
Bumping manifests a=b2g-bump