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

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https://hg.mozilla.org/integration/gaia-1_4/rev/55c98a8ab7b5
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #18252 from justindarc/bug991396

Bug 991396 - [camera][madai] delete dialogue button should be red and sa... r=djf

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https://hg.mozilla.org/integration/gaia-1_4/rev/0c8f866b83e9
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 991666 - Fix removal of old API notifications when selected from the toaster r=alive
Bumping manifests a=b2g-bump