fix(CI): Resolve Kubernetes label option deprecation warning

The 'label' option is deprecated. Using the 'inheritFrom' option for static pod template.

Closes #221 (closed)

utils/ci/Jenkinsfile

@@ -22,7 +22,7 @@ pipeline {
         stage('Linux') {
           agent {
             kubernetes {
-              label 'openpass-agent-pod-' + env.BUILD_NUMBER
+              inheritFrom 'openpass-agent-pod-' + env.BUILD_NUMBER
               yaml """
 apiVersion: v1
 kind: Pod