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

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https://hg.mozilla.org/integration/gaia-central/rev/58b2fc976d52
Author: Marina <mri@tid.es>
Desc: Merge pull request #25028 from gitmai/bug-999491-thumbnails-vcard-contacts

Bug 999491 - thumbnails are not generated for imported vcard contacts

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https://hg.mozilla.org/integration/gaia-central/rev/9a0a8032097d
Author: mai <mri@tid.es>
Desc: Bug 999491 - thumbnails are not generated for imported vcard contacts
Bumping manifests a=b2g-bump