picard markduplicates process medium to high

modules/nf-core/custom/picard/markduplicates/main.nf

 process PICARD_MARKDUPLICATES {
     tag "$meta.id"
-    label 'process_medium'
+    label 'process_high'
 
     conda "bioconda::picard=3.0.0"
     container "${ workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container ?