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

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https://hg.mozilla.org/integration/gaia-central/rev/54b2b63a241c
Author: EragonJ (E.J.) <eragonj@eragonj.me>
Desc: Merge pull request #26465 from EragonJ/bug-1056017

Bug 1056017 - [Arabic] Display problem in Settings App - RTL Support Req...

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https://hg.mozilla.org/integration/gaia-central/rev/c50d02b8eb60
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1056017 - [Arabic] Display problem in Settings App - RTL Support Required.
Bumping manifests a=b2g-bump