Bump mimemagic version
Bump mimemagic version

Bumped mimemagic version to 0.3.7 due to the previous version being
yanked.

cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms,cockroachdb/examples-orms