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

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https://hg.mozilla.org/integration/gaia-central/rev/e997c9b80ced
Author: Luke Chang <lchang@mozilla.com>
Desc: Merge pull request #18020 from luke-chang/992338_bengali_failed_on_eme

Bug 992338 - [B2G][Tarako][Everything.me] The first Bengali keyboard is not working correctly in the everything.me search bar, r=rudylu

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https://hg.mozilla.org/integration/gaia-central/rev/fce4d2833c84
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 992338 - [B2G][Tarako][Everything.me] The first Bengali keyboard is not working correctly in the everything.me search bar
Bumping manifests a=b2g-bump