Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/435eacb69592
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Revert "Bug 1081854: GAIA follow-up to Bug 978639 (for GCF case 31.4.2.1.3). r=drs"

This reverts commit 8ad73b2fa8e1019dcb828c572c742fd55f1e0a18.
Bumping manifests a=b2g-bump