chore(release): Update changelog and package version [skip ci]

Author: Apify Release Bot

CHANGELOG.md

@@ -2,6 +2,16 @@
 
 All notable changes to this project will be documented in this file.
 
+<!-- git-cliff-unreleased-start -->
+
+## 0.21.4 - **not yet released**
+
+### 🐛 Bug Fixes
+
+- Python project detection and project detection ([#774](https://github.com/apify/apify-cli/pull/774)) ([09a42e4](https://github.com/apify/apify-cli/commit/09a42e48b26793578ce845639f7ca921a94d41ff)) by [@vladfrangu](https://github.com/vladfrangu)
+
+<!-- git-cliff-unreleased-end -->
+
 ## [0.21.3](https://github.com/apify/apify-cli/releases/tag/v0.21.3) (2025-03-31)
 
 ### 🚀 Features