chore: mark hydroflow_datalog and hydroflow_macro as unchanged for 0.8.0 release

Author: MingweiSamuel

hydroflow_datalog/CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+Unchanged from previous release.
+
 ## 0.7.0 (2024-05-24)
 
 Unchanged from previous release.

hydroflow_macro/CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+Unchanged from previous release.
+
 ## 0.7.0 (2024-05-24)
 
 ### Refactor