chore: Bump mtags to latest stable

We should avoid using non stable versions since this can cause issues like scalameta/metals#6402

Closes scalameta/metals#6402

Author: tgodzik

project/Build.scala

@@ -1335,10 +1335,10 @@ object Build {
       BuildInfoPlugin.buildInfoDefaultSettings
 
   lazy val presentationCompilerSettings = {
-    val mtagsVersion = "1.3.0+56-a06a024d-SNAPSHOT"
+    // Avoid bumping to snapshot since it's in a different repository than maven central
+    val mtagsVersion = "1.3.1"
 
     Seq(
-      resolvers ++= Resolver.sonatypeOssRepos("snapshots"),
       libraryDependencies ++= Seq(
         "org.lz4" % "lz4-java" % "1.8.0",
         "io.get-coursier" % "interface" % "1.0.18",