Update behavior-changes.md

[runleonarun]

Closes #6463

What are you changing in this pull request and why?

changing behavior flag to reach maturity in 1.10 instead of 1.9

Checklist

• I have reviewed the Content style guide so my content adheres to these guidelines.
• The topic I'm writing about is for specific dbt version(s) and I have versioned it according to the version a whole page and/or version a block of content guidelines.
• I have added checklist item(s) to this list for anything anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."
• The content in this PR requires a dbt release note, so I added one to the release notes page.

---

🚀 Deployment available! Here are the direct links to the updated files:

• https://docs-getdbt-com-git-runleonarun-patch-15-dbt-labs.vercel.app/reference/global-configs/behavior-changes

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
docs-getdbt-com	✅ Ready (Inspect)	Visit Preview	Nov 14, 2024 1:39am