Add changelog entries

Author: ArBridgeman

doc/changes/unreleased.md

@@ -3,3 +3,11 @@
 ## Feature
 
 * #494: Created check of built packages with nox session `package:check`
+
+## Refactoring
+
+* #578: Updated actions/checkout to [v5](https://github.com/actions/checkout/releases/tag/v5.0.0), which uses node 24
+
+## Security
+
+* #578: Resolved CVE-2024-12797 for cryptography and CVE-2025-8869 for pip by updating the lock file