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

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https://hg.mozilla.org/integration/gaia-central/rev/d75252e83e48
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #21101 from RudyLu/system/Bug1030058-remove_assets

Bug 1030058 - apps/system/style/themes/default/images/ui/time_pattern.pn...
r=pivanov

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https://hg.mozilla.org/integration/gaia-central/rev/e17f6c52cc14
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 1030058 - apps/system/style/themes/default/images/ui/time_pattern.png should be
removed.

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https://hg.mozilla.org/integration/gaia-central/rev/7759d2755889
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #19991 from rnowm/1013296

Bug 1013296 - Compose. Change send button to an paper plane icon. r=steveck-chung

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https://hg.mozilla.org/integration/gaia-central/rev/b48b7d480d04
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 1013296 - Compose. Change send button to an paper plane icon
Bumping manifests a=b2g-bump