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

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https://hg.mozilla.org/integration/gaia-1_4/rev/2a9540fdcbeb
Author: Germán Toro del Valle <gtorodelvalle@gmail.com>
Desc: Merge pull request #21398 from gtorodelvalle/v1.4-dialer-bug-1017365-emergency-call-visual-discrepancies-revolutions

Bug 1017365 - [V1.4][Dialer]The "Emergency number" is displayed as "Emergency nu..."

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https://hg.mozilla.org/integration/gaia-1_4/rev/8bf790b7497f
Author: German Toro del Valle <gtorodelvalle@gmail.com>
Desc: Bug 1017365 - [V1.4][Dialer]The "Emergency number" is displayed as "Emergency nu..."
Bumping manifests a=b2g-bump