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

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https://hg.mozilla.org/integration/gaia-central/rev/f96a2a006cb9
Author: Fernando Campo <fcampo@users.noreply.github.com>
Desc: Merge pull request #21459 from fcampo/fte-region-mcc-894121

Bug 894121 - Using MCC automatically selects wrong timezone (r=francisco,achen)

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https://hg.mozilla.org/integration/gaia-central/rev/ead46237c3aa
Author: Fernando Campo <fernando.campo@telefonica.com>
Desc: Bug 894121 - Using MCC automatically selects wrong timezone

- Update timezone when sim unlocked
- Only set 'user-selected' setting if user handles the selectors
- Added tests to timezone selection
Bumping manifests a=b2g-bump