fix: yarn classic was adding an invalid @ to the version

Signed-off-by: Ruben Romero Montes <rromerom@redhat.com>

Author: ruromero

src/main/java/com/redhat/exhort/providers/YarnClassicProcessor.java

@@ -15,15 +15,16 @@
  */
 package com.redhat.exhort.providers;
 
+import java.nio.file.Path;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.TreeMap;
+
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.github.packageurl.PackageURL;
 import com.redhat.exhort.providers.javascript.model.Manifest;
 import com.redhat.exhort.sbom.Sbom;
-import java.nio.file.Path;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.TreeMap;
 
 /** Concrete implementation of the Yarn Classic processor, supporting Yarn 1.x */
 public final class YarnClassicProcessor extends YarnProcessor {
@@ -138,7 +139,7 @@ private static class NodeMetaData {
       this.nodeName = node.get("name").asText();
       var versionIdx = nodeName.lastIndexOf("@");
       this.name = nodeName.substring(0, versionIdx);
-      this.version = nodeName.substring(versionIdx);
+      this.version = nodeName.substring(versionIdx + 1);
       this.purl = JavaScriptProvider.toPurl(name, version);
       var shadowNode = node.get("shadow");
       this.shadow = shadowNode != null && shadowNode.asBoolean();