Blog: 2.1.0 Preview

[tuhaihe]

closes: #ISSUE_Number

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Change logs

Describe your change clearly, including what problem is being solved or what document is being added or updated.

Contributor's checklist

Here are some reminders before you submit your pull request:

• Make sure that your Pull Request has a clear title and commit message. You can take the Git commit template as a reference.
• Learn the code contribution and doc contribution guides for better collaboration.
• Make sure that your changes deployment preview is successful.
• List your communications in the GitHub Issues or Discussions (if has or needed).
• Feel free to ask for the cloudberry committers or other people to help review and approve.

[leborchuk]

We also could add the section of PG core and say that we are under upgrade PG core from 14.4 to 14.22. 2.1 does not include the newest fixes, as I remember correctly, we commenced upgrade from 14.4 to 14.5 and only individual fixes were included. But anyway, it's important to say once more that it's a stable branch

[tuhaihe]

Good suggestion. Let me include the description in the blog.