simplify maven jbotsim repo

build.gradle

@@ -29,10 +29,7 @@ println("${davisFiles}")
 
 repositories {
     jcenter()
-    maven {
-        name = "jbotsim-repo"
-        url =  "https://repo1.maven.org/maven2/io/jbotsim/"
-    }
+    mavenCentral()
     flatDir {
         dirs davisInstall + File.separator + "lib"
     }