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

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https://hg.mozilla.org/integration/gaia-central/rev/db4d4031b50d
Author: Marina <mri@tid.es>
Desc: Merge pull request #25131 from gitmai/bug-1080473-difference-between-byApp-and-global

Bug 1080473 - [Usage] Noticeable difference between by application break...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/facf167e6e37
Author: mai <mri@tid.es>
Desc: Bug 1080473 - [Usage] Noticeable difference between by application breakdown totals and the total displayed in chart and widget

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https://hg.mozilla.org/integration/gaia-central/rev/81e4e4f83035
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #24930 from cctuan/1067231

Bug 1067231 - [Keyboard][Text Selection] Tapping the touch caret should show Paste utility bubble if clipboard is not empty

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https://hg.mozilla.org/integration/gaia-central/rev/a605b824f250
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1082399  - [Keyboard][Text Selection] Tapping the touch caret should show Paste utility bubble if clipboard is not empty
Bumping manifests a=b2g-bump