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

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https://hg.mozilla.org/integration/gaia-central/rev/5036e1dcac4b
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #23680 from gmarty/Bug-1059932-Status-Bar-Increase-priority-download-indicator

Bug 1059932 - [Status Bar] Increase priority of download indicator

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https://hg.mozilla.org/integration/gaia-central/rev/fefcd767128a
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1059932 - [Status Bar] Increase priority of download indicator
Bumping manifests a=b2g-bump