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

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https://hg.mozilla.org/integration/gaia-central/rev/105cc8fcc03b
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #19214 from eeejay/bug-1009858

Bug 1009858 - Introduce accessibility keyboard tests.

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https://hg.mozilla.org/integration/gaia-central/rev/af958d95abff
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1009858 - Introduce accessibility keyboard tests.
Bumping manifests a=b2g-bump