In the documentation for ScriptRunner, there are many instances of this line. This is deprecated, e.g., in https://scriptrunner.adaptavist.com/5.6.8/jira/recipes/misc/running-a-jql-query.html
def user = ComponentAccessor.jiraAuthenticationContext().getUser()
It should be replaced with:
def user = ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser()
I don't know what the deprecation policy is, i.e., if functions will be removed at some point, or stay in the API with a deprecation warning.
Edited: Fixed the copy/paste error with the lines.
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