Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a54c3cd4cf91
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #19985 from Rik/flash-cancel-1019076

Bug 1019076 - Flash of Cancel button when opening Dialer r=drs

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https://hg.mozilla.org/integration/gaia-central/rev/7e4aa353b348
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 1019076 - Flash of Cancel button when opening Dialer

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https://hg.mozilla.org/integration/gaia-central/rev/e6b8d63eeb7b
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #20001 from stasm/1016026-qps-plocm-settings

Bug 1016026 - Add qps-plocm to the list of RTL locales in the Language panel. r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/058d601c76b0
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1016026 - Add qps-plocm to the list of RTL locales in the Language panel. r=arthurcc
Bumping manifests a=b2g-bump