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

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https://hg.mozilla.org/integration/gaia-central/rev/696417134518
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #25309 from stasm/928740-throw-on-missing-strings

Bug 928740 - Throw on missing strings during buildtime

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https://hg.mozilla.org/integration/gaia-central/rev/ced24f970553
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 928740 - Throw on missing strings during buildtime. r=gandalf r=@RickyChien f=flod f=sfoster f=kgrandon f=drs

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https://hg.mozilla.org/integration/gaia-central/rev/a35adac16426
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #26411 from yzen/bug-1102954

[L10n] Add support for aria-moz-hint.

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https://hg.mozilla.org/integration/gaia-central/rev/ec636465c228
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1102954 - [L10n] Add support for aria-moz-hint. r=stas
Bumping manifests a=b2g-bump