Update README.md to deprecate this action

- Resolves: https://linear.app/prefect/issue/PLA-374/simplify-andor-deprecate-actions-prefect-auth
PrefectHQ · Nov 15, 2024 · 1e77913 · 1e77913
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+# Deprecation Notice
+- This github action is deprecated and should no longer be used for authenticating against Prefect Cloud.  To authenticate against Prefect Cloud in your workflows, simply set two environment variables (`PREFECT_API_KEY` & `PREFECT_API_URL`) as described [in the docs](https://docs.prefect.io/3.0/deploy/infrastructure-concepts/deploy-ci-cd#repository-secrets).
+
 # actions-prefect-auth
 
 ## Details