fix: fixes duplicate classpath entries

Running `info classpath` on a GAV would return a result with duplicate
artifacts. This is now fixed.

See #1557

src/main/java/dev/jbang/cli/Info.java

@@ -234,7 +234,7 @@ public Integer doCall() throws IOException {
 
 		ScriptInfo info = getInfo();
 		List<String> cp = new ArrayList<>(info.resolvedDependencies.size() + 1);
-		if (info.applicationJar != null) {
+		if (info.applicationJar != null && !info.resolvedDependencies.contains(info.applicationJar)) {
 			cp.add(info.applicationJar);
 		}
 		cp.addAll(info.resolvedDependencies);