Update gitbucket to 4.44.0

Author: scala-steward-bot

build.sbt

@@ -2,5 +2,5 @@ name := "gitbucket-notifications-plugin"
 organization := "io.github.gitbucket"
 version := "1.11.0"
 scalaVersion := "2.13.16"
-gitbucketVersion := "4.43.0"
+gitbucketVersion := "4.44.0"
 scalacOptions := Seq("-deprecation", "-language:postfixOps", "-feature")