fix: Apply black formatting to resolve CI formatting issues

api_testgen/core/spec_parser.py

@@ -55,10 +55,10 @@ class SpecParser:
             raise InvalidOpenAPISpecError(f"Specification file not found: {self.spec_path}")
 
         try:
-            with open(self.spec_path, 'r', encoding='utf-8') as f:
-                if self.spec_path.suffix in ['.yaml', '.yml']:
+            with open(self.spec_path, "r", encoding="utf-8") as f:
+                if self.spec_path.suffix in [".yaml", ".yml"]:
                     return yaml.safe_load(f) or {}
-                elif self.spec_path.suffix == '.json':
+                elif self.spec_path.suffix == ".json":
                     return json.load(f)
                 else:
                     return yaml.safe_load(f) or {}