Correct Event Action to include endgame event schema (#2610)

rules/linux/credential_access_credential_dumping.toml

@@ -4,7 +4,7 @@ integration = ["endpoint"]
 maturity = "production"
 min_stack_comments = "New fields added: required_fields, related_integrations, setup"
 min_stack_version = "8.3.0"
-updated_date = "2023/02/27"
+updated_date = "2023/04/20"
 
 [rule]
 author = ["Elastic"]
@@ -32,7 +32,7 @@ timestamp_override = "event.ingested"
 type = "eql"
 query = '''
 process where host.os.type == "linux" and process.name == "unshadow" and
-  event.type == "start" and event.action == "exec" and process.args_count >= 2
+  event.type == "start" and event.action in ("exec", "exec_event") and process.args_count >= 2
 '''