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

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https://hg.mozilla.org/integration/gaia-central/rev/75c502a40435
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #25450 from gmarty/Bug-1087788-Status-bar-icons-still-overlapping-with-URL-bar-when-geolocation-icon-is-involved

Bug 1087788 - Status bar icons still overlapping with URL bar when geolo...

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https://hg.mozilla.org/integration/gaia-central/rev/cc50dba263f3
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1087788 - Status bar icons still overlapping with URL bar when geolocation icon is involved
Bumping manifests a=b2g-bump