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

========

https://hg.mozilla.org/integration/gaia-central/rev/3b9a9ca38741
Author: Borja Salguero <borjasalguero@users.noreply.github.com>
Desc: Merge pull request #14653 from fcampo/mms-forward-subject-941030

Bug 941030 - [Messages] Follow up Bug 919966 - Ensure that forwarding a MMS with a subject fills in the subject in the composer

========

https://hg.mozilla.org/integration/gaia-central/rev/8f761d3caa12
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Bug 941030 - [Messages] Follow up Bug 919966 - Ensure that forwarding a MMS with a subject fills in the subject in the composer
Bumping manifests a=b2g-bump