fix(workspace): use public static overload of traverseForMvnw

The 2-arg traverseForMvnw is a private instance method on
JavaMavenProvider. Call the 3-arg public static overload with null
repoRoot instead, which has the same behavior.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Strum355

src/main/java/io/github/guacsec/trustifyda/impl/ExhortApi.java

@@ -1122,7 +1122,8 @@ private String resolveMavenBinary(Path startDir) {
       if (preferWrapper) {
         String wrapperName = Operations.isWindows() ? "mvnw.cmd" : "mvnw";
         String mvnw =
-            JavaMavenProvider.traverseForMvnw(wrapperName, startDir.resolve("pom.xml").toString());
+            JavaMavenProvider.traverseForMvnw(
+                wrapperName, startDir.resolve("pom.xml").toString(), null);
         if (mvnw != null) {
           try {
             Operations.runProcess(startDir, mvnw, "-v");