Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6c110da57ad3
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #23961 from hfiguiere/disc-numbers-list

Track sorting and listing improvements. (Bug 796305 and bug 841977) r=squib

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https://hg.mozilla.org/integration/gaia-central/rev/0dce4677485a
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 796305 - Part 3: Marionette test for single disc

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https://hg.mozilla.org/integration/gaia-central/rev/30be40615f99
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 841977 - Part 3: added marionette tests

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https://hg.mozilla.org/integration/gaia-central/rev/016054bbe144
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 841977 - Part 2: Show track number instead of index. Also disc number if relevant.

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https://hg.mozilla.org/integration/gaia-central/rev/f900c62b3977
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 796305 - Part 2: sort album sublist by track number.
Bumping manifests a=b2g-bump