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

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https://hg.mozilla.org/integration/gaia-central/rev/4ab6447ff83b
Author: Jose Antonio Olivera Ortega <josea.olivera@gmail.com>
Desc: Merge pull request #23462 from rabbihossain/master

Bug 1011584 - Bangladeshi Mobile Network's APN is not available in settings. r=jaoo

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https://hg.mozilla.org/integration/gaia-central/rev/cdb6b990b082
Author: rabbihossain <me@2hr.me>
Desc: Bug 1011584 - Bangladeshi Mobile Network's APN is not available in settings. r=jaoo

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https://hg.mozilla.org/integration/gaia-central/rev/da7987556532
Author: viorelaioia <viorela.ioia@softvision.ro>
Desc: Merge pull request #24100 from chirarobert/fix_airplane_mode

Bug 1067955 - [v2.2][v2.1] Fix test_toggle_airplane_mode

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https://hg.mozilla.org/integration/gaia-central/rev/da606175445a
Author: Robert Chira <robertchira@P5075.(none)>
Desc: Bug 1067955 - [v2.2][v2.1] Fix test_toggle_airplane_mode

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https://hg.mozilla.org/integration/gaia-central/rev/af7e585d9079
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #24094 from jpruden92/bug1061072-contacts-v2

Bug 1061072 - [Contacts] Back 'X' is missing from Set ICE page (Single select mode)

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https://hg.mozilla.org/integration/gaia-central/rev/90d462b88742
Author: jprudencio <jpruden92@gmail.com>
Desc: Bug 1061072 - [Contacts] Back 'X' is missing from Set ICE page (Single select mode)
Bumping manifests a=b2g-bump