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

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https://hg.mozilla.org/integration/gaia-central/rev/6a3ea6ba0554
Author: gitmai <mri@tid.es>
Desc: Merge pull request #23480 from lodr/bug-1058545-recover-header-for-topup

Bug 1058545 - Incorrect visual screen in "Enter the top-up code"
r=mai

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https://hg.mozilla.org/integration/gaia-central/rev/2fab30cc36b7
Author: Salvador de la Puente <salva@unoyunodiez.com>
Desc: Bug 1058545 - Incorrect visual screen in "Enter the top-up code"
Bumping manifests a=b2g-bump