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

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https://hg.mozilla.org/integration/gaia-central/rev/1f96a3d74cc5
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #25792 from RudyLu/keyboard/Bug944662-set_Bulgarian_default_keyboard

Bug 944662 - Set one of the Bulgarian Input Method as default keyboard
r=janjongboom

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https://hg.mozilla.org/integration/gaia-central/rev/954e853039de
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 944662 - Set one of the Bulgarian Input Method as default keyboard
for Bulgarian language.
Bumping manifests a=b2g-bump