languages: add build.gradle.kts to java and scala roots (#6970)

Gradle scripts written in kotlin use a .kts extension:

https://docs.gradle.org/current/userguide/kotlin_dsl.html#sec:scripts

languages.toml

@@ -731,7 +731,7 @@ name = "java"
 scope = "source.java"
 injection-regex = "java"
 file-types = ["java"]
-roots = ["pom.xml", "build.gradle"]
+roots = ["pom.xml", "build.gradle", "build.gradle.kts"]
 language-server = { command = "jdtls" }
 indent = { tab-width = 4, unit = "    " }
 
@@ -1159,7 +1159,7 @@ source = { git = "https://github.com/UserNobody14/tree-sitter-dart", rev = "2d7f
 [[language]]
 name = "scala"
 scope = "source.scala"
-roots = ["build.sbt", "build.sc", "build.gradle", "pom.xml", ".scala-build"]
+roots = ["build.sbt", "build.sc", "build.gradle", "build.gradle.kts", "pom.xml", ".scala-build"]
 file-types = ["scala", "sbt", "sc"]
 comment-token = "//"
 indent = { tab-width = 2, unit = "  " }