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

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https://hg.mozilla.org/integration/gaia-central/rev/af5c9c6b6bf9
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #23606 from RudyLu/keyboard/backout_tests_Bug1053647

Revert "Merge pull request #23343 from RudyLu/keyboard/Bug1053647"

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https://hg.mozilla.org/integration/gaia-central/rev/13a92e91f9e6
Author: Rudy Lu <me@rudy.lu>
Desc: Revert "Merge pull request #23343 from RudyLu/keyboard/Bug1053647"

This reverts commit 39cad6c82122b964f12a66771bfbcc14fb342d9e, reversing
changes made to bc9a482a98e16f011c82f40e3c42bababb159bf1.
Bumping manifests a=b2g-bump