Bump kubernetes-client from 3.1.8 to 4.3.1

Bumps [kubernetes-client](https://github.com/fabric8io/kubernetes-client) from 3.1.8 to 4.3.1.
- [Release notes](https://github.com/fabric8io/kubernetes-client/releases)
- [Changelog](https://github.com/fabric8io/kubernetes-client/blob/master/CHANGELOG.md)
- [Commits](fabric8io/kubernetes-client@v3.1.8...v4.3.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

build.gradle

@@ -66,7 +66,7 @@ dependencies {
     compile group: 'org.apache.commons', name: 'commons-lang3', version: '3.9'
     compile group: 'commons-io', name: 'commons-io', version: '2.6'
     compile group: 'joda-time', name: 'joda-time', version: '2.10.3'
-    compile group: 'io.fabric8', name: 'kubernetes-client', version: '3.1.8'
+    compile group: 'io.fabric8', name: 'kubernetes-client', version: '4.3.1'
     compile group: 'com.github.spullara.mustache.java', name: 'compiler', version: '0.9.6'
     compile group: 'org.freemarker', name: 'freemarker', version: '2.3.28'