Update robots.txt for 0.19.6

[noklam]

Description

Check if we have new datasets release?

Development notes

• Add new rules Allow: */sitemap.xml
• Change / to * because we have version like 0.19.1 and 19.1.post1 now
• Maybe we need to kedro-datasets.3.0.0* to something else, I am not sure what's the new version.

Developer Certificate of Origin

We need all contributions to comply with the Developer Certificate of Origin (DCO). All commits must be signed off by including a Signed-off-by line in the commit message. See our wiki for guidance.

If your PR is blocked due to unsigned commits, then you must follow the instructions under "Rebase the branch" on the GitHub Checks page for your PR. This will retroactively add the sign-off to all unsigned commits and allow the DCO check to pass.

Checklist

• Read the contributing guidelines
• Signed off each commit with a Developer Certificate of Origin (DCO)
• Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• Updated the documentation to reflect the code changes
• Added a description of this change in the RELEASE.md file
• Added tests to cover my changes
• Checked if this change will affect Kedro-Viz, and if so, communicated that with the Viz team

[astrojuanlu]

Going forward we have to find a way to stop doing this, keeping a list of releases like this is error prone #3741

[astrojuanlu]

LGTM! Hope this is the right one 🙏🏼