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

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https://hg.mozilla.org/integration/gaia-central/rev/2d660d4f290f
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #15866 from rnowm/964123

Bug 964123 - [Sora][PLMN][Roaming]'R' icon is not clear while register on VPLMN

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https://hg.mozilla.org/integration/gaia-central/rev/a95557981767
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 964123 - [Sora][PLMN][Roaming]'R' icon is not clear while register on VPLMN.
Bumping manifests a=b2g-bump