Release version(s) that a PR will be included within (#5893)

[Preview](https://docs-getdbt-com-git-dbeatty10-patch-1-dbt-labs.vercel.app/community/resources/oss-expectations#pull-requests)

## What are you changing in this pull request and why?

Clarify when PRs will, won't, or may be backported to versions of dbt
Core that are still in [active or
critical](https://docs.getdbt.com/docs/dbt-versions/core#ongoing-patches)
support.

## Checklist
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
so my content adheres to these guidelines.

---------

Co-authored-by: Mirna Wong <[email protected]>
Co-authored-by: Matt Shaver <[email protected]>

website/docs/community/resources/oss-expectations.md

@@ -107,3 +107,7 @@ PRs are your surest way to make the change you want to see in dbt / packages / d
 - **Tests!** When you open a PR, some tests and code checks will run. (For security reasons, some may need to be approved by a maintainer.) We will not merge any PRs with failing tests. If you’re not sure why a test is failing, please say so, and we’ll do our best to get to the bottom of it together.
 - **Contributor License Agreement** (CLA): This ensures that we can merge your code, without worrying about unexpected implications for the copyright or license of open source dbt software. For more details, read: ["Contributor License Agreements"](../resources/contributor-license-agreements.md)
 - **Changelog:** In projects that include a number of changes in each release, we need a reliable way to signal what's been included. The mechanism for this will vary by repository, so keep an eye out for notes about how to update the changelog.
+
+### Inclusion in release versions
+
+Both bug fixes and backwards-compatible new features will be included in the [next minor release](/docs/dbt-versions/core#how-dbt-core-uses-semantic-versioning). Fixes for regressions and net-new bugs that were present in the minor version's original release will be backported to versions with [active support](/docs/dbt-versions/core). Other bug fixes may be backported when we have high confidence that they're narrowly scoped and won't cause unintended side effects.