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

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https://hg.mozilla.org/integration/gaia-1_4/rev/9ebc4e558e05
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22051 from justindarc/bug1037880-v1.4

Bug 1037880 - FM radio should stop sound in speaker mode when I receive ...

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https://hg.mozilla.org/integration/gaia-1_4/rev/5df634fdb4fe
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1037880 - FM radio should stop sound in speaker mode when I receive an incoming call
Bumping manifests a=b2g-bump