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

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https://hg.mozilla.org/integration/gaia-central/rev/eb3cd285b797
Author: Albert <alberto.crespellperez@telefonica.com>
Desc: Merge pull request #25454 from acperez/bug-1064710

Bug 1064710 - Add 3 MVNO for Germany. r=jaoo

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https://hg.mozilla.org/integration/gaia-central/rev/e660a3ecf37e
Author: Albert <alberto.crespellperez@telefonica.com>
Desc: Bug 1064710 - Add 3 MVNO for Germany. r=jaoo
Bumping manifests a=b2g-bump