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

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https://hg.mozilla.org/integration/gaia-central/rev/eca3a524bcd4
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 1009065 - Make focused Rocketbar full width on all devices. r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/c2aee90a903e
Author: Gareth Aye <gaye@mozilla.com>
Desc: Update calendar README, grammar nit

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https://hg.mozilla.org/integration/gaia-central/rev/df406b3a70ff
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #19600 from gaye/update-calendar-readme

Update calendar README

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https://hg.mozilla.org/integration/gaia-central/rev/dece9f459af8
Author: gaye <gaye@mozilla.com>
Desc: Update calendar README
Bumping manifests a=b2g-bump