docs: update changelog for release v1.0.5 (#315)

Author: danceratopz

docs/CHANGELOG.md

@@ -4,17 +4,15 @@ Test fixtures for use by clients are available for each release on the [Github r
 
 **Key:** ✨ = New, 🐞 = Fixed, 🔀 = Changed, 💥 = Breaking change.
 
-## 🔜 [Unreleased]
+## [v1.0.5](https://github.com/ethereum/execution-spec-tests/releases/tag/v1.0.5) - 2023-09-26: 🐍🏖️ Cancun Devnet 9 Release 3
+
+This release mainly serves to update the EIP-4788 beacon roots address to `0x000F3df6D732807Ef1319fB7B8bB8522d0Beac02`, as updated in [ethereum/EIPs/pull/7672](https://github.com/ethereum/EIPs/pull/7672).
 
 ### 🧪 Test Cases
 
 - 🐞 [EIP-4844](https://eips.ethereum.org/EIPS/eip-4844): Fix invalid blob txs pre-Cancun engine response ([#306](https://github.com/ethereum/execution-spec-tests/pull/306)).
 - ✨ [EIP-4788](https://eips.ethereum.org/EIPS/eip-4788): Final update to the beacon root address ([#312](https://github.com/ethereum/execution-spec-tests/pull/312)).
 
-### 🛠️ Framework
-
-### 🔧 EVM Tools
-
 ### 📋 Misc
 
 - ✨ Docs: Changelog added ([#305](https://github.com/ethereum/execution-spec-tests/pull/305)).