Add changelog entry for v6.16.0 (#44531)

github-actions[bot] · changelogbot · web-flow · commit 021beb23f60f · 2025-10-02T15:59:36.000-04:00
Co-authored-by: changelogbot &lt;changelogbot@hashicorp.com&gt;
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,3 +1,5 @@
+## 6.16.0 (Unreleased)
+
 ## 6.15.0 (October 2, 2025)
 
 BREAKING CHANGES:
