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

========

https://hg.mozilla.org/integration/gaia-1_4/rev/1dddd0b4747d
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #18483 from crdlc/bug-997461-v1.4

Bug 997461 - Cannot open bookmarks installed with v1.3 in v1.4

========

https://hg.mozilla.org/integration/gaia-1_4/rev/d87d27ac5e65
Author: crdlc <crdlc@tid.es>
Desc: Bug 997461 - Cannot open bookmarks installed with v1.3 in v1.4
Bumping manifests a=b2g-bump