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

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https://hg.mozilla.org/integration/gaia-central/rev/1e48642e5823
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #16116 from RudyLu/keyboard/Bug967857-Bengali_UI

Bug 967857 - Add specific CSS rules for Bengali - Probhat keyboard to
r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/de42f75a6531
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 967857 - Add specific CSS rules for Bengali - Probhat keyboard to
avoid truncation.

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https://hg.mozilla.org/integration/gaia-central/rev/7b6addf37fec
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #14120 from ian-liu/settings/Bug929860_SD_card_formatting

Bug 929860 - [Gaia] SD card formatting, r=@evelynhung

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https://hg.mozilla.org/integration/gaia-central/rev/eb08c956c853
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 929860 - [Gaia] SD card formatting
Bumping manifests a=b2g-bump