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

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https://hg.mozilla.org/integration/gaia-central/rev/fb54fbd4849b
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #17054 from gasolin/issue-796519

Bug 796519 - Nit - When accessing a network on the wifi page that requir...r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/a0dc3a34da98
Author: gasolin <gasolin@gmail.com>
Desc: Bug 796519 - Nit - When accessing a network on the wifi page that requires a username/password, use username, not identifier
Bumping manifests a=b2g-bump