fix: use sqlite image versions

[fenech]

Related issue

Proposed changes

The docker-compose command in the quickstart guide failed with messages like

time=2021-04-09T13:53:32Z level=warning msg=Unable to connect to database, retrying. audience=application error=map[message:unsupported dialect 'sqlite3'] service_name=ORY Keto service_version=master

It runs successfully when using the -sqlite versions of the images.

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
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  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]

My bad, thanks a lot 👍