Updating "Future Release" language (#4512)

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

Updating the future releases language based on this thread:
https://dbt-labs.slack.com/archives/C02NCQ9483C/p1700150288170989

## 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.
- [x] For [docs
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#about-versioning),
review how to [version a whole
page](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
and [version a block of
content](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#versioning-blocks-of-content).
- [x] Add a checklist item for anything that needs to happen before this
PR is merged, such as "needs technical review" or "change base branch."

website/docs/docs/dbt-versions/core-versions.md

@@ -56,7 +56,7 @@ After a minor version reaches the end of its critical support period, one year a
 
 ### Future versions
 
-We aim to release a new minor "feature" every 3 months. _This is an indicative timeline ONLY._ For the latest information about upcoming releases, including their planned release dates and which features and fixes might be included in each, always consult the [`dbt-core` repository milestones](https://github.com/dbt-labs/dbt-core/milestones).
+For the latest information about upcoming releases, including planned release dates and which features and fixes might be included, consult the [`dbt-core` repository milestones](https://github.com/dbt-labs/dbt-core/milestones) and [product roadmaps](https://github.com/dbt-labs/dbt-core/tree/main/docs/roadmap).
 
 ## Best practices for upgrading