Update script path

Author: praveenkuttappan

eng/pipelines/templates/stages/archetype-python-release.yml

@@ -207,7 +207,7 @@ stages:
 
               - task: Powershell@2
                 inputs:
-                  filePath: /eng/common/scripts/Mark-ReleasePlanCompletion.ps1
+                  filePath: eng/common/scripts/Mark-ReleasePlanCompletion.ps1
                   arguments: >
                     -PackageInfoFilePath '$(Pipeline.Workspace)/${{parameters.ArtifactName}}/PackageInfo/${{artifact.name}}.json'
                   pwsh: true