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

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https://hg.mozilla.org/integration/gaia-central/rev/2c31857e3104
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #19044 from EragonJ/bug-1007466

Bug 1007466 - [Setting] DSDS related panels can't work when testing on N...

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https://hg.mozilla.org/integration/gaia-central/rev/49560b195964
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1007466 - [Setting] DSDS related panels can't work when testing on Nightly
Bumping manifests a=b2g-bump