Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/21716026341b
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #24097 from empoalp/bug_1054818_2

Bug 1054818 - [Sora][Call][Settings]The call time display abnormal after...

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https://hg.mozilla.org/integration/gaia-central/rev/938cffa2f7eb
Author: David Garcia <davidg@tid.es>
Desc: Bug 1054818 - [Sora][Call][Settings]The call time display abnormal after user change the system time.
Bumping manifests a=b2g-bump