Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b710813303f9
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #25308 from stasm/1011519-hide-ar-fr-zhTW

Bug 1011519 - Use pseudolocales in tests

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https://hg.mozilla.org/integration/gaia-central/rev/1b25f92559fc
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1011519 - Use pseudolocales in tests. r=gandalf r=kgrandon r=arthurcc
Bumping manifests a=b2g-bump