Add changelog entry for v6.15.0 (#44400)

github-actions[bot] · changelogbot · web-flow · commit f5ed7f2de5a9 · 2025-09-22T13:22:46.000-04:00
Co-authored-by: changelogbot &lt;changelogbot@hashicorp.com&gt;
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,3 +1,5 @@
+## 6.15.0 (Unreleased)
+
 ## 6.14.1 (September 22, 2025)
 
 NOTES:
