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

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https://hg.mozilla.org/integration/gaia-central/rev/8c025d0c8038
Author: pacorampas <b.frv@tid.es>
Desc: Merge pull request #26137 from pacorampas/1094781-v2

Bug 1094781 - [Dialer][Callscreen] The call on hold shouldn't be red (follow up 977588) r=german

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https://hg.mozilla.org/integration/gaia-central/rev/5befcd49fe2a
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1094781 - [Dialer][Callscreen] The call on hold shouldn't be red (follow up 977588)
Bumping manifests a=b2g-bump