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

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https://hg.mozilla.org/integration/gaia-central/rev/975ad3e4cb19
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #25974 from cctuan/1095320

Bug 1095320 - [Text Selection] Copy/Paste bubble is behind the rocketbar backdrop if we select word in rocketbar.

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https://hg.mozilla.org/integration/gaia-central/rev/0bc7349ec935
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1095320 - [Text Selection] Copy/Paste bubble is behind the rocketbar backdrop if we select word in rocketbar

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https://hg.mozilla.org/integration/gaia-central/rev/13627c629dd0
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Merge pull request #26037 from millermedeiros/1095738-rename-months-day

Bug 1095738 - [Calendar] rename the MonthsDay view r=gaye

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https://hg.mozilla.org/integration/gaia-central/rev/9ef2d24dcee9
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 1095738 - [Calendar] rename the MonthsDay view
Bumping manifests a=b2g-bump