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

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https://hg.mozilla.org/integration/gaia-central/rev/39ba256131e3
Author: Florin Strugariu <florin.strugariu@softvision.ro>
Desc: Merge pull request #26587 from yzen/bug-1106541

Bug 1106541 - scoping a present day selector to active month.

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https://hg.mozilla.org/integration/gaia-central/rev/7a13d55acdeb
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1106541 - scoping a present day selector to active month.
Bumping manifests a=b2g-bump