chore: bump Kafka versions for 26.7

[razvan]

Description

Related image PR: stackabletech/docker-images#1483

Update Kafka versions to 3.9.2 and 4.2.1 everywhere.

--- PASS: kuttl (1754.31s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/opa_kafka-latest-3.9.2_zookeeper-latest-3.9.4_opa-latest-1.16.2_use-opa-tls-true_openshift-false_krb5-1.21.1 (446.00s)
        --- PASS: kuttl/harness/cluster-operation_kafka-latest-3.9.2_zookeeper-latest-3.9.4_openshift-false (49.79s)
        --- PASS: kuttl/harness/operations-kraft_kafka-kraft-4.2.1_openshift-false (553.60s)
        --- PASS: kuttl/harness/smoke_kafka-3.9.2_zookeeper-3.9.4_use-client-tls-true_openshift-false (87.02s)
        --- PASS: kuttl/harness/logging_kafka-3.9.2_zookeeper-latest-3.9.4_openshift-false (126.55s)
        --- PASS: kuttl/harness/tls_kafka-3.9.2_zookeeper-latest-3.9.4_use-client-tls-true_use-client-auth-tls-true_openshift-false (247.95s)
        --- PASS: kuttl/harness/upgrade_upgrade_old-3.9.2_upgrade_new-4.2.1_use-client-tls-true_use-client-auth-tls-true_openshift-false (160.28s)
        --- PASS: kuttl/harness/operations-kraft_kafka-kraft-3.9.2_openshift-false (444.78s)
        --- PASS: kuttl/harness/smoke-kraft_kafka-kraft-3.9.2_openshift-false (490.33s)
        --- PASS: kuttl/harness/configuration_kafka-latest-3.9.2_openshift-false (12.19s)
        --- PASS: kuttl/harness/delete-rolegroup_kafka-3.9.2_zookeeper-latest-3.9.4_openshift-false (49.03s)
        --- PASS: kuttl/harness/smoke-kraft_kafka-kraft-4.2.1_openshift-false (599.21s)
        --- PASS: kuttl/harness/kerberos_kafka-3.9.2_zookeeper-latest-3.9.4_openshift-false_krb5-1.21.1_kerberos-realm-PROD.MYCORP_kerberos-backend-mit_broker-listener-class-cluster-internal_bootstrap-listener-class-cluster-internal (240.46s)
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