Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_4/rev/f53df8fa512e
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #20127 from DouglasSherk/1017831-intermittent-simsettingshelper

Bug 1017831 - Fix intermittently failing SimSettingsHelper._setToSettingsDB test. r=eragonj
Bumping manifests a=b2g-bump