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

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https://hg.mozilla.org/integration/gaia-central/rev/6539431752b8
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #25545 from tauzen/Bug1087853_records_instead_of_tech

Bug 1087853 - NFC: NfcManager should use message.records to check for NDEF content, r=gweng

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https://hg.mozilla.org/integration/gaia-central/rev/6d86b90fae50
Author: Krzysztof Mioduszewski <kmioduszewski@gmail.com>
Desc: Bug 1087853 - NFC: NfcManager should use message.records to check for NDEF content, r=gwneg
Bumping manifests a=b2g-bump