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

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https://hg.mozilla.org/integration/gaia-central/rev/4ce7d38f52ce
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #23219 from awiss/bug1057277-signature-button

Bug 1057277 - [Email][Signature] Signature text displayed different with UX specification r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/74f8a7b96016
Author: Alex Wissmann <awiss@wharton.upenn.edu>
Desc: Bug 1057277 - [Email][Signature] Signature text displayed different with UX specification

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https://hg.mozilla.org/integration/gaia-central/rev/aa7309fd593f
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #22746 from mikehenrty/bug-1041901-contacts-theme

Bug 1041901 - Fix contacts theme color

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https://hg.mozilla.org/integration/gaia-central/rev/e3fc78face36
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1041901 - Fix contacts theme color
Bumping manifests a=b2g-bump