Removing Future Release Dates (#4457)

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

Removing the future release dates table from the release page 

Closes: #4063

## Checklist

- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
and [About
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
so my content adheres to these guidelines.
- [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/snippets/core-versions-table.md

@@ -12,11 +12,3 @@
 | [**v1.0**](/docs/dbt-versions/core-upgrade/upgrading-to-v1.0) ⚠️ | Dec 3, 2021     | Deprecated ⛔️  | Deprecated ⛔️           | 
 |  **v0.X** ⛔️                                               | (Various dates) | Deprecated ⛔️  | Deprecated ⛔️            | 
 _*All versions of dbt Core since v1.0 are available in dbt Cloud until further notice. Versions that are EOL do not receive any fixes. For the best support, we recommend upgrading to a version released within the past 12 months._
-### Planned future releases
-
-_Future release dates are tentative and subject to change._
-
-| dbt Core | Planned Release | Critical & dbt Cloud Support Until  |
-|----------|-----------------|-------------------------------------|
-| **v1.8** | _Jan 2024_      | _Jan 2025_                          |
-| **v1.9** | _Apr 2024_      | _Apr 2025_                          |