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

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https://hg.mozilla.org/integration/gaia-central/rev/f2dfe6bee72f
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #26477 from huchengtw-moz/bug-1104650-focus-lost-after-activity

Bug 1104650 - [Stingray] switch focus to activity's parent window when i..., r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/058666608792
Author: John Hu <johu@mozilla.com>
Desc: Bug 1104650 - [Stingray] switch focus to activity's parent window when it is killed.
Bumping manifests a=b2g-bump