Bump nf-slack to 0.5.0

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: FriederikeHanssen

.github/workflows/cloudtest.yml

@@ -91,7 +91,7 @@ jobs:
             }
           nextflow_config: |
             plugins {
-              id 'nf-slack@0.4.1'
+              id 'nf-slack@0.5.0'
             }
             slack {
               enabled = true