Bumping gaia.json for 8 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/78f3e4468882
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #19896 from pivanov/bug-1019216

Bug 1019216 - [Flame] The network status bars are being clipped

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https://hg.mozilla.org/integration/gaia-central/rev/a98ec342fa89
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1019216 - [Flame] The network status bars are being clipped

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https://hg.mozilla.org/integration/gaia-central/rev/e39bb718881c
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #19462 from pivanov/bug-1008121-followup

Bug 1008121 followup - [VDR][Calendarl] Apply Buttons [BB]

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https://hg.mozilla.org/integration/gaia-central/rev/181302b9588c
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 1008121 followup - [VDR][Calendarl] Apply Buttons [BB]

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https://hg.mozilla.org/integration/gaia-central/rev/dd935ffeb183
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #19974 from gasolin/issue-1017858

Bug 1017858 -[B2G][Settings][Legal Information] 'Open Source Notices' page will never load r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/427b9afdafec
Author: gasolin <gasolin@gmail.com>
Desc: Bug 1017858 - [B2G][Settings][Legal Information] 'Open Source Notices' page will never load

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https://hg.mozilla.org/integration/gaia-central/rev/cffc0229adc4
Author: Michał Budzyński <michal@virtualdesign.pl>
Desc: Merge pull request #19908 from michalbe/Bug1018819

Bug 1018819 - Move TAG_OPTIONS to separate file

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https://hg.mozilla.org/integration/gaia-central/rev/9cac83faaaf4
Author: Michal Budzynski <michal@virtualdesign.pl>
Desc: Bug 1018819 - Move TAG_OPTIONS to separate file r=arcturus

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Bumping manifests a=b2g-bump