chore(release): prepare for 1.6.9 (#400)

## [1.6.9] - 2026-08-17

### ⚙️ Miscellaneous Tasks

- *(deps)* Update golang:1.26.5 docker digest to e8ab809 (#392)
- *(deps)* Update go toolchain directive to v1.26.6 [security] (#395)
- *(deps)* Update golang docker tag to v1.26.6 (#394)
- Derive Go version from go.mod instead of 'stable' (#397)

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---

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

Reviewed-on: #400
Co-authored-by: Unbound Releaser <releaser@unbound.se>

.version

@@ -1,3 +1,3 @@
 {
-  "version": "1.6.8"
+  "version": "1.6.9"
 }

CHANGELOG.md

@@ -2,7 +2,16 @@
 
 All notable changes to this project will be documented in this file.
 
-## [1.6.8] - 2026-08-09
+## [1.6.9] - 2026-08-17
+
+### ⚙️ Miscellaneous Tasks
+
+- *(deps)* Update golang:1.26.5 docker digest to e8ab809 (#392)
+- *(deps)* Update go toolchain directive to v1.26.6 [security] (#395)
+- *(deps)* Update golang docker tag to v1.26.6 (#394)
+- Derive Go version from go.mod instead of 'stable' (#397)
+
+## [1.6.8] - 2026-08-10
 
 ### 🐛 Bug Fixes