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

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https://hg.mozilla.org/integration/gaia-2_0/rev/960518d8cf86
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #23450 from weigao123/Bug1057905-v2.0

Bug 1057905 - [v2.0] Avoid activeApp is null when receiving STK message. r=Tim.

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https://hg.mozilla.org/integration/gaia-2_0/rev/5a9bafad9e91
Author: wei.gao <wei.gao@spreadtrum.com>
Desc: Bug 1057905 - [v2.0] Avoid activeApp is null when receiving STK message. r=Tim.
Bumping manifests a=b2g-bump