Sentry: Increase disk space

After the last upgrades, the disk remains almost full. @olasd has changed the kafka retention policy from 24h to 6h, but the free disk space remains around 1% actually (1.1 Go available)

The space will be extended by 16Go for a total of 80Go to avoid any out of disk issue

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Migrated from T2910 (view on Phabricator)