Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/633328133e6d
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #18787 from zacc/bug_990214

Bug 990214 - Remove clearing of /data/local/webapps from cleanup_data to...

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https://hg.mozilla.org/integration/gaia-central/rev/6306a3b5dc5f
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 990214 - Remove clearing of /data/local/webapps from cleanup_data to unblock runs on Inari

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https://hg.mozilla.org/integration/gaia-central/rev/023857d88305
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #18950 from crdlc/bug-1005939

Bug 1005939 - Border radius is displayed before images are loaded in merge list

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https://hg.mozilla.org/integration/gaia-central/rev/6a1d16c34ddf
Author: crdlc <crdlc@tid.es>
Desc: Bug 1005939 - Border radius is displayed before images are loaded in merge list

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https://hg.mozilla.org/integration/gaia-central/rev/683a93909506
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #18949 from crdlc/bug-1005954

Bug 1005954 - Images are not loaded in merge list

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https://hg.mozilla.org/integration/gaia-central/rev/6eb1b9e99054
Author: crdlc <crdlc@tid.es>
Desc: Bug 1005954 - Images are not loaded in merge list
Bumping manifests a=b2g-bump