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

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https://hg.mozilla.org/integration/gaia-central/rev/075c487ef7d0
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #22209 from EragonJ/bug-1033950

Bug 1033950 - [Settings] update selectors in AMDed wifi panel from #id t...

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https://hg.mozilla.org/integration/gaia-central/rev/304220b64e9f
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1033950 - [Settings] update selectors in AMDed wifi panel from #id to .class

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https://hg.mozilla.org/integration/gaia-central/rev/140308b13a35
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #22322 from azasypkin/bug-990021-mms-airplane

Bug 990021 - [Messages] We should show the correct error message when trying to download a MMS in airplane mode. r=schung

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https://hg.mozilla.org/integration/gaia-central/rev/0149a50de872
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 990021 - [Messages] We should show the correct error message when trying to download a MMS in airplane mode. r=schung
Bumping manifests a=b2g-bump