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

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https://hg.mozilla.org/integration/gaia-central/rev/73a88b32b0eb
Author: Salvador de la Puente González <neo.salvador@gmail.com>
Desc: Merge pull request #25574 from lodr/bug-1078384-move-mms-label

Bug 1078384 - [MMS] Move MMS label to appear always at the end of the subject line

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https://hg.mozilla.org/integration/gaia-central/rev/70a268f88e8f
Author: Salvador de la Puente <salva@unoyunodiez.com>
Desc: Bug 1078384 - [MMS] Move MMS label to appear always at the end of the subject line
Bumping manifests a=b2g-bump