[FEATURE REQ] Replace Tokens task update to version 6

[krishnavatsavai]

Please describe the feature.

The replace tokens task - task: qetza.replacetokens.replacetokens-task.replacetokens@3
is currently using version 3. Can this be updated to a latest version as our Azure DevOps environment is not supporting the version 3. Thank you.

[github-actions]

  Thank you for opening this issue! Please be patient while we will look into it and get back to you as this is an open source project. In the meantime make sure you take a look at the [closed issues](https://github.com/Azure/apiops/issues?q=is%3Aissue+is%3Aclosed) in case your question has already been answered. Don't forget to provide any additional information if needed (e.g. scrubbed logs, detailed feature requests,etc.).
  Whenever it's feasible, please don't hesitate to send a Pull Request (PR) our way. We'd greatly appreciate it, and we'll gladly assess and incorporate your changes.

[waelkdouh]

Feel free to open a PR and we will merge it.

[krishnavatsavai]

Hi Wael Kdouh (@waelkdouh) created a PR #622. Thank you