Update gradle version

[taer]

The new gradle versions after 7 give this error when executing tasks in pygradle

   - Error: Type 'com.innobead.gradle.task.PythonTestTask' property 'virtualenvDir' is missing an input or output annotation.
      
      Reason: A property without annotation isn't considered during up-to-date checking.
      
      Possible solutions:
        1. Add an input or output annotation.
        2. Mark it as @Internal.
      
      Please refer to https://docs.gradle.org/7.2/userguide/validation_problems.html#missing_annotation for more details about this problem.
  See https://docs.gradle.org/7.2/userguide/more_about_tasks.html#sec:task_input_output_annotations for more information on how to annotate task properties.

Also bumped up the Kotlin version

[innobead]

LGTM