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

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https://hg.mozilla.org/integration/gaia-central/rev/2ecb83c8dbc4
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #18177 from nucliweb/994586-BB-Update-Recipients-pills

Bug 994586 - [Building Blocks] Update Recipients pills r=me

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https://hg.mozilla.org/integration/gaia-central/rev/c75030659eeb
Author: Joan Leon <joan.leon@gmail.com>
Desc: 994586 - [Building Blocks] Update Recipients pills
Bumping manifests a=b2g-bump