Update dependency io.fabric8:kubernetes-client to v5.12.4

Author: renovate[bot]

pom.xml

@@ -39,7 +39,7 @@
     <sonar.projectKey>dropwizard_dropwizard-kubernetes</sonar.projectKey>
 
     <brave.version>5.17.0</brave.version>
-    <fabric8.kubernetes-client.version>5.10.2</fabric8.kubernetes-client.version>
+    <fabric8.kubernetes-client.version>5.12.4</fabric8.kubernetes-client.version>
     <okhttp-client.version>3.14.9</okhttp-client.version>
     <okhttp-metrics.version>0.4.0</okhttp-metrics.version>
   </properties>