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

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https://hg.mozilla.org/integration/gaia-1_4/rev/4c5a231df5f9
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #21640 from Rik/callscreen-truncation-1033196

Bug 1033196 - When dialing the user name part which containing j/g chara... r=drs

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https://hg.mozilla.org/integration/gaia-1_4/rev/69f7321a98dc
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 1033196 - When dialing the user name part which containing j/g characters would be incomplete
Bumping manifests a=b2g-bump