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

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https://hg.mozilla.org/integration/gaia-central/rev/3683e8cfe54e
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #20369 from rnowm/1022878

Bug 1022878 - [B2G][Lockscreen] Long pressing power button on lockscreen does not bring up reboot menu r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/c6b9300ce288
Author: rnowm <arnau@arnaumarch.com>
Desc: [B2G][Lockscreen] Long pressing power button on lockscreen does not bring up reboot menu

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https://hg.mozilla.org/integration/gaia-central/rev/21a871a6db7b
Author: Albert <acperez@tid.es>
Desc: Merge pull request #20370 from acperez/bug-1023288

Bug 1023288 - NFC configuration is not working correctly in variant.json file.

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https://hg.mozilla.org/integration/gaia-central/rev/c984bd596e44
Author: Albert <acperez@tid.es>
Desc: Bug 1023288 - NFC configuration is not working correctly in variant.json file.
Bumping manifests a=b2g-bump