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

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https://hg.mozilla.org/integration/gaia-central/rev/3e54f1dde9af
Author: Albert <acperez@tid.es>
Desc: Merge pull request #18026 from acperez/bug-912445

Bug 912445 - Show specific information when there is a server connection issue with an application.

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https://hg.mozilla.org/integration/gaia-central/rev/60811d916e8e
Author: Albert <acperez@tid.es>
Desc: Bug 912445 - Show specific information when there is a server connection issue with an application.
Bumping manifests a=b2g-bump