chore: Replace serde_yaml with yaml_serde

[xeniape]

Description

Part of stackabletech/issues#898

Integrationtests

--- PASS: kuttl (216.20s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/tls_openshift-false_rsa-key-length-2048_custom-secret-names-False (16.95s)
        --- PASS: kuttl/harness/non-sensitive-data (45.96s)
        --- PASS: kuttl/harness/listener_openshift-false (21.11s)
        --- PASS: kuttl/harness/tls-truststore_openshift-false_truststore-target-kind-Secret (9.78s)
        --- PASS: kuttl/harness/kerberos_krb5-1.21.1_openshift-false (60.71s)
        --- PASS: kuttl/harness/tls-truststore_openshift-false_truststore-target-kind-ConfigMap (11.62s)
        --- PASS: kuttl/harness/tls_openshift-false_rsa-key-length-3072_custom-secret-names-True (29.19s)
        --- PASS: kuttl/harness/tls_openshift-false_rsa-key-length-3072_custom-secret-names-False (34.23s)
        --- PASS: kuttl/harness/tls_openshift-false_rsa-key-length-2048_custom-secret-names-True (18.11s)
        --- PASS: kuttl/harness/cert-manager-tls_openshift-false (127.72s)
PASS

Unittests

test result: ok. 34 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.11s

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

[NickLarsenNZ]

LGTM