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

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https://hg.mozilla.org/integration/gaia-central/rev/405ad4cd91f3
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #24818 from albertopq/1073480-remove-count

Bug 1073480 - Remove the notifications counter r=etienne_s

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https://hg.mozilla.org/integration/gaia-central/rev/08cc5b133e09
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1073480 - Remove the notifications counter
Bumping manifests a=b2g-bump