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

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https://hg.mozilla.org/integration/gaia-central/rev/f1409654ab92
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #24835 from stasm/1073338-walkContent-recursion

Bug 1073338 - "Too much recursion" error when using Pseudolocale. r=gandalf

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https://hg.mozilla.org/integration/gaia-central/rev/8d112a1c4d66
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1073338 - Use Object.keys in walkContent. r=gandalf
Bumping manifests a=b2g-bump