Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/59e4d048bb9f
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #22744 from mikehenrty/bug-1041896-email-statusbar

Fix calendar theme color

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https://hg.mozilla.org/integration/gaia-central/rev/52d3e8444e90
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1041896 - Fix calendar theme color

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https://hg.mozilla.org/integration/gaia-central/rev/806f386d3cb8
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #23204 from vingtetun/revert.activity

Revert "Merge pull request #23194 from vingtetun/reduce.overpaint.activi...

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https://hg.mozilla.org/integration/gaia-central/rev/00eb1ec1d189
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Revert "Merge pull request #23194 from vingtetun/reduce.overpaint.activity"

This reverts commit 21876ef6754a28b3bfebb954ffc11469dc4f66f6, reversing
changes made to ce59ac1ae31db296f297ec30090ede3616029f5b.

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https://hg.mozilla.org/integration/gaia-central/rev/7a2fc561c79c
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #23202 from vingtetun/remove.statusbartest.verticalhome

Bug 1056046 - Remove statusbar-background dead code. followup2. r=me

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https://hg.mozilla.org/integration/gaia-central/rev/5043e2cbb392
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Bug 1056046 - Remove statusbar-background dead code. followup2. r=me
Bumping manifests a=b2g-bump