Update warning-diff-scalafix-plugin to 0.6.4

Author: xuwei-k-bot[bot]

project/plugins.sbt

@@ -40,7 +40,7 @@ addSbtPlugin("com.github.xuwei-k" % "sbt-jshell" % "0.1.5")
 addSbtPlugin("com.github.xuwei-k" % "sbt-root-aggregate" % "0.1.0")
 addSbtPlugin("com.github.xuwei-k" % "scalafix-rule-resource-gen" % "0.1.1")
 addSbtPlugin("com.github.xuwei-k" % "test-times-plugin" % "0.1.1")
-addSbtPlugin("com.github.xuwei-k" % "warning-diff-scalafix-plugin" % "0.6.3")
+addSbtPlugin("com.github.xuwei-k" % "warning-diff-scalafix-plugin" % "0.6.4")
 addSbtPlugin("com.julianpeeters" % "sbt-avrohugger" % "2.16.3")
 addSbtPlugin("com.siriusxm" % "sbt-snapshot4s" % "0.2.7")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.5")