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

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https://hg.mozilla.org/integration/gaia-central/rev/70c97cdbc620
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23100 from mikehenrty/bug-960126-notification-get-tests

Bug 960126 - Re-enable Notification.get tests

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https://hg.mozilla.org/integration/gaia-central/rev/cae7cd1d345c
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 960126 - Re-enable Notification.get tests

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https://hg.mozilla.org/integration/gaia-central/rev/788dac75a669
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23780 from mikehenrty/bug-1061221-notification-resend-intermittent

Bug 1061221 - re-enable resend test

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https://hg.mozilla.org/integration/gaia-central/rev/957db987ebfd
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1061221 - re-enable resend test
Bumping manifests a=b2g-bump