fix: keto Deployment strategy reference

[jagregory]

The Keto chart references the Deployment strategy from the wrong location in the values.yaml file, this change updates the Deployment spec to use the correct location.

Related Issue or Design Document

Fixes #697

Checklist

• [x] I have read the contributing guidelines and signed the CLA.
• [x] I have referenced an issue containing the design document if my change introduces a new feature.
• [x] I have read the security policy.
• [x] 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 approval (please contact security@ory.sh) 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 the necessary documentation within the code base (if appropriate).

Further comments