Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/202b338d057c
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #18085 from rnowm/987791

Bug 987791 - [Browser] is not using action menu [BB] r=benfrancis

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https://hg.mozilla.org/integration/gaia-central/rev/b8833f4524a8
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 987791 - [Browser] is not using action menu [BB]

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https://hg.mozilla.org/integration/gaia-central/rev/573937ba1dfa
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #17756 from rnowm/987061

Bug 987061 - [Dialer] Switch Tab bar to the new proposal r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/30de5a49fc06
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 987061 - [Dialer] Switch Tab bar to the new proposal
Bumping manifests a=b2g-bump