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

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https://hg.mozilla.org/integration/gaia-central/rev/90338e62c0fb
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #24520 from gauravmittal1995/new_tab

Bug 1068894 - Replacing 'Open link in New Tab' to 'Open in New Window' r=benfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/2d25a8e6aaf1
Author: Gaurav Mittal <gaurav.mittal@students.iiit.ac.in>
Desc: Bug 1068894 - Replacing 'Open link in New Tab' to 'Open in New Window' R=gauravmittal1995
Bumping manifests a=b2g-bump