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

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https://hg.mozilla.org/integration/gaia-central/rev/498331882845
Author: GaryChen, PYChen, Gary <mmm198219@gmail.com>
Desc: Merge pull request #26727 from mpizza/Bug_1104434_master

Bug 1104434 - [FFOS2.0][Woodduck][PLMN]PNN and SPN can not display when ...

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https://hg.mozilla.org/integration/gaia-central/rev/732479b41cc4
Author: mpizza <mmm198219@gmail.com>
Desc: Bug 1104434 - [FFOS2.0][Woodduck][PLMN]PNN and SPN can not display when register onto HPLMN
Bumping manifests a=b2g-bump