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

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https://hg.mozilla.org/integration/gaia-central/rev/7e08d1fefea8
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 976124 - Python update clock/alarm locator for edit panel

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https://hg.mozilla.org/integration/gaia-central/rev/ff0ee4cb91d1
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Update DM Strings r=kaze, arcturus" for causing gaia-unit test failures

This reverts commit 1e6949eaea6cb23be1de5955fc6b0827af7b40f0.

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https://hg.mozilla.org/integration/gaia-central/rev/220f8c0a542e
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #16567 from AndreiH/bug_976022

Bug 976022 - Intermittent test_clock_delete_alarm.TestClockDeleteAlarm

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https://hg.mozilla.org/integration/gaia-central/rev/8d7f69f23759
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 976022 - Intermittent test_clock_delete_alarm.TestClockDeleteAlarm
Bumping manifests a=b2g-bump