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

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https://hg.mozilla.org/integration/gaia-2_0/rev/c5ec7f4e0bb8
Author: gitmai <mri@tid.es>
Desc: Merge pull request #19819 from gitmai/bug-1017581-error-settings

Bug 1017581 -Usage app shows nothing post upgrade
r=salva

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https://hg.mozilla.org/integration/gaia-2_0/rev/3cb35980314c
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #20901 from etiennesegonzac/bug-1028002

Bug 1028002 - Make sure an appWindow is in 'opened' state once we got the animationend and mozbrowserloadened instead of waiting for the opening timeout. r=timdream

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https://hg.mozilla.org/integration/gaia-2_0/rev/e3d5e5c2e9aa
Author: Min-Zhong "John" Lu <mnjul@users.noreply.github.com>
Desc: Merge pull request #20791 from mnjul/bug_1027536_lockscreen_clock_stall

Bug 1022984 / Bug 1027536 - After Restarting Phone, Lockscreen Time Always Shows as 5:32 or Is Stalled. r=gweng

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https://hg.mozilla.org/integration/gaia-2_0/rev/0d357bfe32cb
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 1017333 - Clear notifications when we open the call log

Also don't clear notifications when we reopen the dialer app on another tab
Bumping manifests a=b2g-bump