SOLR-18233 Fix test failure in AuthToolTest

Author: janhoy

solr/core/src/test/org/apache/solr/cli/AuthToolTest.java

@@ -67,7 +67,7 @@ public void testEnableAuth() throws Exception {
       "--solr-include-file",
       solrIncludeFile.toAbsolutePath().toString(),
       "--credentials",
-      "solr:solr",
+      "solr:solrRocks",
       "--block-unknown",
       "true"
     };