add changelog for 1.21.5

Katie Horne · Katie Horne · commit 7a283eb11c92 · 2021-09-29T09:46:51.000-05:00
diff --git a/changelog/1.21.5.md b/changelog/1.21.5.md
@@ -0,0 +1,22 @@
+---
+title: "1.21.5"
+description: "Released on 09/29/2021"
+---
+
+### Breaking changes ❗
+
+There are no breaking changes in 1.21.5.
+
+### Features ✨
+
+There are no new features in 1.21.5.
+
+### Bug fixes 🐛
+
+- web: fixed the dev URL button not opening the correct hostname after editing
+  the dev URL on a satellite
+- infra: fixed panic in authenticated dev URLs served on satellites
+
+### Security updates 🔐
+
+There are no security updates in 1.21.5.
