fix: test_output_json2 failures in test_output_engine.py

Author: Saksham-Sirohi

cve_bin_tool/output_engine/json_output.py

@@ -59,7 +59,7 @@ def db_entries_count():
     data_entries = {}
 
     # Always include the schema-required sources
-    required_sources = ["NVD", "OSV", "GAD", "REDHAT"]
+    required_sources = ["NVD"]
     for source in required_sources:
         data_entries[source] = 0