Style fix: correct copy-paste mistake in test package name (#8451)

Author: sbergen

modules/openapi-generator/src/test/java/org/openapitools/codegen/csharpnetcore/CSharpNetCoreClientCodegenTest.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.openapitools.codegen.csharp;
+package org.openapitools.codegen.csharpnetcore;
 
 import org.openapitools.codegen.languages.CSharpNetCoreClientCodegen;
 import org.testng.Assert;