chore(release): prepare for v0.4.0 (#100)

## [0.4.0] - 2026-04-17

### 🚀 Features

- Auto-enable path-style addressing when a custom endpoint is set (#99)

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---

**Note:** Please use **Squash Merge** when merging this PR.

Reviewed-on: #100
Co-authored-by: Unbound Releaser <releaser@unbound.se>
Co-committed-by: Unbound Releaser <releaser@unbound.se>

.version

@@ -1,3 +1,3 @@
 {
-  "version": "v0.3.0"
+  "version": "v0.4.0"
 }

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.4.0] - 2026-04-17
+
+### 🚀 Features
+
+- Auto-enable path-style addressing when a custom endpoint is set (#99)
+
 ## [0.3.0] - 2026-04-16
 
 ### 🚀 Features