Merge pull request #561 from actions/robherley/deprecation-notice

Update readme with v3/v2/v1 deprecation notice

Author: robherley

README.md

@@ -1,5 +1,11 @@
 # `@actions/upload-artifact`
 
+> [!WARNING]
+> actions/upload-artifact@v3 is scheduled for deprecation on **November 30, 2024**. [Learn more.](https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/)
+> Similarly, v1/v2 are scheduled for deprecation on **June 30, 2024**.
+> Please update your workflow to use v4 of the artifact actions.
+> This deprecation will not impact any existing versions of GitHub Enterprise Server being used by customers.
+
 Upload [Actions Artifacts](https://docs.github.com/en/actions/using-workflows/storing-workflow-data-as-artifacts) from your Workflow Runs. Internally powered by [@actions/artifact](https://github.com/actions/toolkit/tree/main/packages/artifact) package.
 
 See also [download-artifact](https://github.com/actions/download-artifact).