Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/26b3f842b757
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #26394 from alivedise/bugzilla/1097675/ignore-hidden-attention-window

Bug 1097675 - Ignore hidden window when updating attention indicator, r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/dc39f37e9129
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1097675 - Ignore hidden window when updating attention indicator

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https://hg.mozilla.org/integration/gaia-central/rev/33128e5b7819
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #25989 from alivedise/bugzilla/1096133/home-event-dispatcher

Bug 1096133 - Get rid of stopImmediatePropagation, r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/34ae42f06aa2
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1096133 - Get rid of stopImmediatePropagation of hierarchy events
Bumping manifests a=b2g-bump