chore: Replace serde_yaml with yaml_serde

[adwk67]

Description

Part of stackabletech/issues#898

⚠️ Wait for a new op-rs release.

--- PASS: kuttl (499.81s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/smoke_airflow-3.3.1_openshift-false_executor-kubernetes (381.16s)
        --- PASS: kuttl/harness/smoke_airflow-3.3.1_openshift-false_executor-celery (499.79s)
PASS

--- PASS: kuttl (200.88s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/overrides_airflow-latest-3.3.1_openshift-false (200.81s)
PASS

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

Author

• Changes are OpenShift compatible
• CRD changes approved
• CRD documentation for all fields, following the style guide.
• Helm chart can be installed and deployed operator works
• Integration tests passed (for non trivial changes)
• Changes need to be "offline" compatible
• Links to generated (nightly) docs added
• Release note snippet added

Reviewer

• Code contains useful comments
• Code contains useful logging statements
• (Integration-)Test cases added
• Documentation added or updated. Follows the style guide.
• Changelog updated
• Cargo.toml only contains references to git tags (not specific commits or branches)

Acceptance

• Feature Tracker has been updated
• Proper release label has been added
• Links to generated (nightly) docs added
• Release note snippet added
• Add type/deprecation label & add to the deprecation schedule
• Add type/experimental label & add to the experimental features tracker

[sbernauer]

Thanks! Some minor suggestions

[sbernauer]

Thanks!