Update acyclic to 0.3.18 (#186)

Pull request: #186

Author: scala-steward

build.mill

@@ -12,7 +12,7 @@ val scala213 = "2.13.10"
 val scala3 = "3.3.1"
 
 val osLib = "0.10.3"
-val acyclic = "0.3.12"
+val acyclic = "0.3.18"
 
 val githubOrg = "com-lihaoyi"
 val githubRepo = "mainargs"