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

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https://hg.mozilla.org/integration/gaia-central/rev/46a604d70635
Author: RickyChien <RickyChien@users.noreply.github.com>
Desc: Merge pull request #26173 from mozilla-b2g/revert-26101-bug-1022728

Revert "Bug 1022728 - Prevent building gaia when running ./build.sh gecko

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https://hg.mozilla.org/integration/gaia-central/rev/8b17ea7f537c
Author: RickyChien <RickyChien@users.noreply.github.com>
Desc: Revert "Bug 1022728 - Prevent building gaia when running ./build.sh gecko"

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https://hg.mozilla.org/integration/gaia-central/rev/499d16a64799
Author: Tzu-Lin Huang <dwi019@gmail.com>
Desc: Merge pull request #26171 from dwi2/bug1014405

Bug 1014405 - [Stingray] Keyboard event handling in Gaia, r=johnhu

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https://hg.mozilla.org/integration/gaia-central/rev/eab031938fa7
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1014405 - [Stingray] Keyboard event handling in Gaia
Bumping manifests a=b2g-bump