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

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https://hg.mozilla.org/integration/gaia-central/rev/e981bce58346
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #24753 from albertopq/1071706-dark-lockscreen

Bug 1071706 - Dark icons on lockscreen r=etienne_s

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https://hg.mozilla.org/integration/gaia-central/rev/19cea0301c6f
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1071706 - Dark icons on lockscreen

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https://hg.mozilla.org/integration/gaia-central/rev/f923cab952a4
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #24892 from jmcanterafonseca/fix_edit2times_v22

Bug 1073484 - [GAIA][Contacts]Edit two times in contact search result in...

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https://hg.mozilla.org/integration/gaia-central/rev/d1b8947317a0
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 1073484 - [GAIA][Contacts]Edit two times in contact search result in improper contact data
Bumping manifests a=b2g-bump