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

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https://hg.mozilla.org/integration/gaia-central/rev/4ea81d5b40c9
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #25331 from kumarrishav/Bug-1054635

Bug 1054635 - Context menu/long tap on container area in Composer panel causes javascript error. r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/858fe8997401
Author: kumarrishav <rishav006@gmail.com>
Desc: Bug 1054635 - Context menu/long tap on container area in Composer panel causes javascript error
Bumping manifests a=b2g-bump