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

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https://hg.mozilla.org/integration/gaia-central/rev/1cdf0400b69d
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #19202 from rnowm/1001298

Bug 1001298 - [EMAIL] update search UI to latest VD r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/b863804cdeb2
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 1001298 - [EMAIL] update search UI to latest VD

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https://hg.mozilla.org/integration/gaia-central/rev/87ec2959fce6
Author: Guillaume C. Marty <edo999@gmail.com>
Desc: Merge pull request #19271 from gmarty/bug-1010580-FTE-Progress-bar-overlaps-the-step-by-step-tutorial

Bug 1010580 - [FTE] Progress bar overlaps the step-by-step tutorial

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https://hg.mozilla.org/integration/gaia-central/rev/75b10f1dec2b
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1010580 - [FTE] Progress bar overlaps the step-by-step tutorial
Bumping manifests a=b2g-bump