Update languages/java/README.md

Co-authored-by: Marcel Jacek <72880145+marceljk@users.noreply.github.com>

Author: rubenhoenle

languages/java/README.md

@@ -2,7 +2,7 @@
 
 The `templates` directory contains only our customized Java templates. Beside these customized templates,
 the original templates of openapi-generator for Java are used. These can be found in the
-official GitHub repo of the [openapi-generator](https://github.com/OpenAPITools/openapi-generator/tree/v7.14.0/modules/openapi-generator/src/main/resources/Java).
+official GitHub repo of the [openapi-generator](https://github.com/OpenAPITools/openapi-generator/tree/v7.19.0/modules/openapi-generator/src/main/resources/Java).
 
 If you need to change something in the Java Generator, try always first to add
 [user-defined templates](https://openapi-generator.tech/docs/customization#user-defined-templates),