fix: ERROR: The Compose file './docker-compose.yml' is invalid

[devpolo]

Related issue

Got this issue will docker-compose up on the cat-videos-example folder exemple.

ERROR: The Compose file './docker-compose.yml' is invalid because:
services.keto.volumes contains an invalid type, it should be a string

Proposed changes

update docker compose version 3 -> 3.2
Source

Checklist

• I have read the contributing guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security. vulnerability, I
  confirm that I got green light (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further comments

[zepatrik]

Thanks a lot, don't know why it works for me without.