Add note on old registrar deprecations (#1964)

* Add note on old registrar deprecations

* fix link

* review

src/content/chainlink-automation/overview/automation-release-notes.mdx

@@ -13,6 +13,7 @@ whatsnext:
 
 **Chainlink Automation Release Notes**
 
+- [Registrar deprecation through v2.0](#2024-06-03---registrar-deprecation-through-v20)
 - [Automation on Polygon Amoy](#2024-04-23---automation-on-polygon-amoy)
 - [Polygon testnet support](#2024-04-13---polygon-testnet-support)
 - [Automation StreamsLookup error handler](#2024-03-07---automation-streamslookup-error-handler)
@@ -33,6 +34,10 @@ whatsnext:
 - [Keepers v1.1 launch on Ethereum](#2021-08-05---keepers-v11-launch-on-ethereum)
 - [Questions](#questions)
 
+## 2024-06-03 - Registrar deprecation through v2.0
+
+Older Automation [registrars](/chainlink-automation/reference/automation-contracts#automationregistrarsol) for v1.0, v1.1, v1.2, v1.3, and v2.0 are deprecated on all [supported networks](/chainlink-automation/overview/supported-networks) (Ethereum, Avalanche, BSC, Polygon, Arbitrum and Optimism). You can no longer register new upkeeps using these older versions. Please [migrate your older upkeeps to Automation 2.1](/chainlink-automation/guides/migrate-to-v2) to ensure they remain operational as we start deprecating older versions.
+
 ## 2024-04-23 - Automation on Polygon Amoy
 
 Chainlink Automation is live on [Polygon Amoy](/chainlink-automation/overview/supported-networks#amoy-testnet).