update sbt, scala version (#69)

Author: wing328

build.sbt

@@ -10,8 +10,8 @@ specifications as part of your build. Other tasks are available as command line
 lazy val `sbt-openapi-generator` = (project in file("."))
   .settings(
     scalaVersion := "2.12.20",
-    crossScalaVersions := Seq(scalaVersion.value, "3.7.2"),
-    crossSbtVersions := List("1.3.10"),
+    crossScalaVersions := Seq(scalaVersion.value),
+    crossSbtVersions := List("1.11.4"),
     sbtPlugin := true,
 
     inThisBuild(List(