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

========

https://hg.mozilla.org/integration/gaia-central/rev/4a4698b5efbf
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #25137 from stasm/1081040-mozL10n-cleanup

Bug 1081040 - Clean up internal mozL10n API. r=gandalf

========

https://hg.mozilla.org/integration/gaia-central/rev/7c79e982c979
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1081040 - Clean up internal mozL10n API. r=gandalf
Bumping manifests a=b2g-bump