Upgrade spring-boot-starter-actuator and spring-kafka fixing vulns

Upgrade spring-boot-starter-actuator from 3.0.4 to 3.0.6. This indirectly upgrades spring-boot-actuator-autoconfigure from 3.0.4 to 3.0.6 fixing Access Restriction Bypass:

https://security.snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORKBOOT-5441321

Upgrade spring-kafka from 3.0.4 to 3.0.6.

Upgrading spring-kafka indirectly upgrades spring-expression from 6.0.6 to 6.0.8 fixing Allocation of Resources Without Limits or Throttling:

https://nvd.nist.gov/vuln/detail/CVE-2023-20861
https://nvd.nist.gov/vuln/detail/CVE-2023-20863

Upgrading spring-kafka indirectly upgrades kafka-clients from 3.3.2 to 3.4.0 fixing Deserialization of Untrusted Data:

https://nvd.nist.gov/vuln/detail/CVE-2023-25194