Bump brouter from `23c8123` to `73e7873`

Bumps brouter from 23c8123 to 73e7873.

Commits

• 73e7873 Merge pull request #697 from quaelnix/remove-traffic-simulation
• 0b6500c Merge pull request #700 from mjaschen/task/update-geojson-mime-type
• a6611ed Merge pull request #701 from mjaschen/task/iso8601-compatible-log-timestamps
• 4e858f5 ISO8601 compatible timestamps in log output
• 6d7b8f0 Update MIME type for GeoJSON responses
• 2a94b7f Remove unused traffic simulation code
• 8270ae6 Merge pull request #693 from quaelnix/gravel-profile
• 584a2a8 Update gravel.brf
• f2c01b8 Merge pull request #690 from zod/docker-publish
• 36e169a Merge pull request #689 from zod/pmd-7
• Additional commits viewable in compare view

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