fix(codegen): Fixing the url of openapi-generator-url (#8)

Author: spasumarthi21

Utilities/codegen/download-codegen.bat

@@ -4,6 +4,6 @@ SETLOCAL
 
 SET script-path=%~dp0
 
-powershell -Command "(new-object System.Net.WebClient).DownloadFile('http://central.maven.org/maven2/org/openapitools/openapi-generator-cli/4.2.2/openapi-generator-cli-4.2.2.jar', '%script-path%openapi-generator-cli-4.2.2.jar')"
+powershell -Command "(new-object System.Net.WebClient).DownloadFile('http://insecure.repo1.maven.org/maven2/org/openapitools/openapi-generator-cli/4.2.2/openapi-generator-cli-4.2.2.jar', '%script-path%openapi-generator-cli-4.2.2.jar')"
 
 ENDLOCAL