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

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https://hg.mozilla.org/integration/gaia-central/rev/5ece575c4899
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #15061 from EragonJ/bug-955954

Bug 955954 - "SIM 1" show up on some places on a one-SIM device

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https://hg.mozilla.org/integration/gaia-central/rev/69ca4198b388
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 955954 - "SIM 1" show up on some places on a one-SIM device

- add test for this case