Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-1_4/rev/2a07d4fafc89
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #17290 from etiennesegonzac/bug-984882-callscreen-display-l10n-followup

Bug 984882 - 946874 l10n follow up. r=rik

========

https://hg.mozilla.org/integration/gaia-1_4/rev/4cd7fcefb057
Author: russnicoletti <rnicoletti@mozilla.com>
Desc: Merge pull request #17260 from russnicoletti/bug980581

Bug 980581 - Previous video clip title remains when a new video clip is ...

========

https://hg.mozilla.org/integration/gaia-1_4/rev/58513c34006b
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Merge pull request #17162 from sergi/976470

Bug 976470 - [Buri][FDN] After entering incorrect PIN 2 code 3 times in resetting PIN2 process, no PUK2 request page
Bumping manifests a=b2g-bump