Update gitbucket to 4.38.4

Author: scala-steward-bot

build.sbt

@@ -2,7 +2,7 @@ organization := "gitbucket"
 name := "gitbucket-pages-plugin"
 scalaVersion := "2.13.10"
 version := "1.10.0"
-gitbucketVersion := "4.38.3"
+gitbucketVersion := "4.38.4"
 scalacOptions := Seq("-unchecked", "-deprecation", "-encoding", "utf8", "-feature")
 
 scalafmtOnCompile := true